https://sextantbook.com/2025/06/27/a-man-and-his-sextant/https://sextantbook.com/wp-content/uploads/2025/06/sextant.pngSextanthttps://sextantbook.com/wp-content/uploads/2025/06/003.jpg003https://sextantbook.com/wp-content/uploads/2025/06/26276.1.jpg26276.12025-07-01T05:28:47+00:00monthlyhttps://sextantbook.com/2023/01/09/a-slip-of-workmanship/https://sextantbook.com/wp-content/uploads/2023/01/calibrator2.jpgcalibrator2https://sextantbook.com/wp-content/uploads/2023/01/keeper.jpgKeeperhttps://sextantbook.com/wp-content/uploads/2023/01/measure.jpgMeasurehttps://sextantbook.com/wp-content/uploads/2023/01/centres.jpgCentreshttps://sextantbook.com/wp-content/uploads/2023/01/tapered-gap.jpgTapered gap2023-01-09T03:56:32+00:00monthlyhttps://sextantbook.com/2022/07/25/a-french-sextant-restoration/https://sextantbook.com/wp-content/uploads/2022/07/french-composite-sextant-025.jpgOLYMPUS DIGITAL CAMERAOLYMPUS DIGITAL CAMERAhttps://sextantbook.com/wp-content/uploads/2022/07/french-composite-sextant-024.jpgOLYMPUS DIGITAL CAMERAOLYMPUS DIGITAL CAMERAhttps://sextantbook.com/wp-content/uploads/2022/07/french-composite-sextant-023.jpgOLYMPUS DIGITAL CAMERAOLYMPUS DIGITAL CAMERAhttps://sextantbook.com/wp-content/uploads/2022/07/12-horizon-shades.jpg12-horizon-shadeshttps://sextantbook.com/wp-content/uploads/2022/07/5-tangent-screw.jpg5-tangent-screwhttps://sextantbook.com/wp-content/uploads/2022/07/15-telescope-bracket-exploded.jpg15-telescope-bracket-explodedhttps://sextantbook.com/wp-content/uploads/2022/07/14-telescope-bracket.jpg14-telescope-bracketFigure 7: Telescope mountinghttps://sextantbook.com/wp-content/uploads/2022/07/4-index-adjust-exploded.jpg4-index-adjust-explodedhttps://sextantbook.com/wp-content/uploads/2022/07/3-index-error-adjust.jpg3-index-error-adjusthttps://sextantbook.com/wp-content/uploads/2022/07/13-horizon-mirror-etc.jpg13-horizon-mirror-etc2022-08-08T23:04:42+00:00monthlyhttps://sextantbook.com/2013/12/29/alphabetical-list-of-posts/2022-07-25T23:43:26+00:00monthlyhttps://sextantbook.com/2010/03/06/a-an-index-to-posts/2022-07-25T22:58:14+00:00monthlyhttps://sextantbook.com/2022/04/14/refilling-a-kollsman-bubble-chamber-a-guest-post-by-arthur-leung/2022-04-14T23:24:49+00:00monthlyhttps://sextantbook.com/2021/10/14/a-small-ramsden-sextant/https://sextantbook.com/wp-content/uploads/2021/10/index-adj-detail-1.jpgIndex adj detailFigure 9: Index error adjustment detail.https://sextantbook.com/wp-content/uploads/2021/10/tilt-detail.jpgTilt detailFigure 8: Rotating base detail.https://sextantbook.com/wp-content/uploads/2021/10/tilt-002.jpgTilt 002Figure 7: Horizon mirror adjustments.https://sextantbook.com/wp-content/uploads/2021/10/tangent-screw-003.jpgTangent screw 003Figure 6: Scales and Tangent screw detailshttps://sextantbook.com/wp-content/uploads/2021/10/back-plan.jpgBack planFigure 5: Rear view of restored instrument.https://sextantbook.com/wp-content/uploads/2021/10/3-quarter-rear.jpg3 quarter rearFigure 4: Restoration nearly complete.https://sextantbook.com/wp-content/uploads/2021/10/name.jpgNameFigure 2: Name.https://sextantbook.com/wp-content/uploads/2021/10/magnifier-detail.jpgMagnifier detailFigure 2: New magnifier arm.https://sextantbook.com/wp-content/uploads/2021/10/1-as-found.jpg1 As foundFigure 1: Sextant as received2021-10-14T02:32:35+00:00monthlyhttps://sextantbook.com/2021/06/10/a-reproduction-mhr1-position-line-slide-rule/2021-10-09T21:06:13+00:00monthlyhttps://sextantbook.com/2021/10/09/un-cercle-de-reflection-reflecting-circle/https://sextantbook.com/wp-content/uploads/2021/10/shades.jpgOLYMPUS DIGITAL CAMERAOLYMPUS DIGITAL CAMERAhttps://sextantbook.com/wp-content/uploads/2021/10/horzon-ie.jpgOLYMPUS DIGITAL CAMERAOLYMPUS DIGITAL CAMERAhttps://sextantbook.com/wp-content/uploads/2021/10/horizon-tilt.jpgOLYMPUS DIGITAL CAMERAOLYMPUS DIGITAL CAMERAhttps://sextantbook.com/wp-content/uploads/2021/10/tangent-screw-1.jpgTangent screwhttps://sextantbook.com/wp-content/uploads/2021/10/tangent-lock.jpgTangent lockhttps://sextantbook.com/wp-content/uploads/2021/10/handle.jpgOLYMPUS DIGITAL CAMERAOLYMPUS DIGITAL CAMERA2021-10-09T20:58:15+00:00monthlyhttps://sextantbook.com/2021/05/28/6112/2021-06-10T22:06:51+00:00monthlyhttps://sextantbook.com/2021/05/06/mercury-amalgam-mirrors/2021-05-07T00:29:42+00:00monthlyhttps://sextantbook.com/2020/10/28/mending-a-1975-sno-t-sextant/2020-10-28T22:58:02+00:00monthlyhttps://sextantbook.com/2008/11/17/aircraft-bubble-sextants/2020-06-12T09:13:43+00:00monthlyhttps://sextantbook.com/2020/06/09/a-freiberger-scale-illuminator/https://sextantbook.com/wp-content/uploads/2020/06/lighting-switch.jpgLighting switchFigure 4: End view of switch.https://sextantbook.com/wp-content/uploads/2020/06/lighting-bulbs.jpgLighting bulbsFigure 3: New and old bulbs.https://sextantbook.com/wp-content/uploads/2020/06/lighting-exploded.jpgLighting explodedFigure 2: Lighting unit exploded.https://sextantbook.com/wp-content/uploads/2020/06/lighting-ga-on-sextant.jpgLighting GA on sextantFigure 1: Lighting unit as found.2020-06-09T22:20:46+00:00monthlyhttps://sextantbook.com/2018/06/13/an-old-wooden-quadrant-restored/https://sextantbook.com/wp-content/uploads/2018/06/octant-no-name-019.jpgOLYMPUS DIGITAL CAMERAFigure 16 : Completed instrument in its new homehttps://sextantbook.com/wp-content/uploads/2018/06/16-secondary-mirror.jpg16 Secondary mirrorFigure 3 : Mirrorand pinule for back sight.https://sextantbook.com/wp-content/uploads/2018/06/15-1-fouled-anchor.jpg15.1 Fouled anchorhttps://sextantbook.com/wp-content/uploads/2018/06/15-fouled-anchor.jpg15 Fouled anchorFigure 15 : Ghost of Ramsden?https://sextantbook.com/wp-content/uploads/2018/06/14-repairs-complete-front.jpg14 Repairs complete frontFigure 11 : Front with finished part before painting.https://sextantbook.com/wp-content/uploads/2018/06/13-repairs-complete-rear.jpg13 Repairs complete, rearFigure 12: Rear before painting of replacement partshttps://sextantbook.com/wp-content/uploads/2018/06/12-details-of-new-parts-back.jpg12 Details of new parts, backFigure 10 : Details of replacement parts on back.https://sextantbook.com/wp-content/uploads/2018/06/11-case-side.jpg11 Case sideFigure 16 : Finished case exterior.https://sextantbook.com/wp-content/uploads/2018/06/10-case-front.jpg10 Case fronthttps://sextantbook.com/wp-content/uploads/2018/06/9-laminating-case-front.jpg9 Laminating case frontFigure 14 ; Gluing up the laminae.2020-02-03T21:08:53+00:00monthlyhttps://sextantbook.com/2020/01/18/a-late-c18-wooden-quadrant-restored/https://sextantbook.com/wp-content/uploads/2020/01/14-horizon-adj-exploded.jpg14 Horizon adj explodedFigure 19: Horizon mirror adjustments exploded.https://sextantbook.com/wp-content/uploads/2020/01/13-horizon-adjust.jpg13 Horizon adjustFigure 18: Horizon mirror index adjustment.https://sextantbook.com/wp-content/uploads/2020/01/12-bracket-detail.jpg12 Bracket detailhttps://sextantbook.com/wp-content/uploads/2020/01/11-h-mirror-detail.jpg11 H mirror detailFigure 17: Horizon mirror and bracket.https://sextantbook.com/wp-content/uploads/2020/01/9-index-mirror-rear.jpg9 Index mirror rearFigure 15: Rear of index mirror bracket.https://sextantbook.com/wp-content/uploads/2020/01/9a-index-mirror-front.jpg9a Index mirror frontFigure 14: Front of index mirror and bracket.https://sextantbook.com/wp-content/uploads/2020/01/16-shades.jpg16 ShadesFigure 14: Index shades.https://sextantbook.com/wp-content/uploads/2020/01/index-bearing-002.jpgIndex bearing 002Figure 12: Structure of index bearing.https://sextantbook.com/wp-content/uploads/2020/01/large-octant-024.jpgOLYMPUS DIGITAL CAMERAOLYMPUS DIGITAL CAMERAhttps://sextantbook.com/wp-content/uploads/2020/01/7-peep-sight.jpg7 Peep sightFigure 12: Rear of peep sight.2020-01-20T20:55:02+00:00monthlyhttps://sextantbook.com/contact/2019-08-30T23:03:12+00:00weekly0.6https://sextantbook.com/blog/2019-08-30T23:02:36+00:00weekly0.6https://sextantbook.com/about-the-author/https://sextantbook.com/wp-content/uploads/2008/10/authorpic1.jpgAuthorpic1Bill Morrishttps://sextantbook.com/wp-content/uploads/2008/10/quadrant3.jpgquadrant3Bill Morris using historic ball-recording quadrant2019-08-30T23:01:44+00:00weekly0.6https://sextantbook.com/buy-the-book/https://sextantbook.com/wp-content/uploads/2008/10/btn_buynowcc_lg_global1.gifbtn_buynowcc_lg_global1https://sextantbook.com/wp-content/uploads/2008/10/btn_buynowcc_lg_global.gifbtn_buynowcc_lg_globalBuy Now2019-08-30T22:59:49+00:00weekly0.6https://sextantbook.com/2019/01/23/german-ww-ii-gyrosextant-see-kreisel-sextant/https://sextantbook.com/wp-content/uploads/2019/01/gyro-bearing-detail-1.jpggyro bearing detailFigure: Gyro bearing detail.https://sextantbook.com/wp-content/uploads/2019/01/ga-rhs-1.jpgga rhsFigure 2: Right hand sidehttps://sextantbook.com/wp-content/uploads/2019/01/ga-left-side-1.jpgga left sideFigure 1: Left hand side.https://sextantbook.com/wp-content/uploads/2019/01/handle-in-situ.jpgOLYMPUS DIGITAL CAMERAFigure 14: handle in place.https://sextantbook.com/wp-content/uploads/2019/01/directions.jpgdirectionsFigure: Instructionshttps://sextantbook.com/wp-content/uploads/2019/01/lightpath-2.jpglightpath 2Figure 13: Light path through sextant.https://sextantbook.com/wp-content/uploads/2019/01/1-case-inside-1.jpg1 case insideFigure 12: Sextant in its case, with accessories.https://sextantbook.com/wp-content/uploads/2019/01/battery-compartment.jpgbattery compartmentFigure 11: 6 volt battery pack in placehttps://sextantbook.com/wp-content/uploads/2019/01/gyro-lamp-carrier-closeup.jpggyro lamp carrier closeupFigure 10: Detail of gyro lamp carrier.https://sextantbook.com/wp-content/uploads/2019/01/gyro-extterior-labelled.jpggyro extterior labelledFigure 9: Exterior of gyro unit.2019-01-23T22:25:40+00:00monthlyhttps://sextantbook.com/2019/01/13/a-french-hydrographic-sextant/https://sextantbook.com/wp-content/uploads/2019/01/8-index-shades-1.jpg8 index shadesFigure Shades mounting.https://sextantbook.com/wp-content/uploads/2019/01/7-horizon-mirror.jpg7 horizon mirrorFugure 8: Horizon mirror detail.https://sextantbook.com/wp-content/uploads/2019/01/15-telescopes.jpg15 telescopesFigure 15: Telescope kit.https://sextantbook.com/wp-content/uploads/2019/01/14-rising-piece.jpg14 rising piecehttps://sextantbook.com/wp-content/uploads/2019/01/13-rising-piece-in-situ.jpg13 rising piece in situFigure 14: Telescope bracket. https://sextantbook.com/wp-content/uploads/2019/01/12-lighting-system.jpg12 lighting systemFigure 13: Lighting bulb holder.https://sextantbook.com/wp-content/uploads/2019/01/11-a-journal-contact.jpg11 a journal contactFigure 12: Insulated index arm contact.https://sextantbook.com/wp-content/uploads/2019/01/10-b-handle-to-bearing.jpg10 b handle to bearingFigure 10: Wire from handle to foot.https://sextantbook.com/wp-content/uploads/2019/01/10-a-switch-to-contact.jpg10 a switch to contactFigure 11: Inside of foot.https://sextantbook.com/wp-content/uploads/2019/01/9-battery-handle.jpg9 battery handleFigure 9: Interior of battery handle.2019-01-13T08:25:25+00:00monthlyhttps://sextantbook.com/2018/11/26/hughes-marine-bubble-sextant/https://sextantbook.com/wp-content/uploads/2018/11/in-case2-e1543269345805.jpgIn caseFigure 10: HMBS in its case.https://sextantbook.com/wp-content/uploads/2018/11/light-path-2.jpgLight path 2Figure 9: Light paths in bubble unithttps://sextantbook.com/wp-content/uploads/2018/11/bubble-unit-labelled1.jpgBubble unit labelledFigure 8: Interior of bubble unit.https://sextantbook.com/wp-content/uploads/2018/11/rhs-labelled-e1543268661798.jpgRHS labelledFigure 7: Controls and read-outs.https://sextantbook.com/wp-content/uploads/2018/11/index-mirror-3.jpgIndex mirror 3Figure 6: Index mirror mounting.https://sextantbook.com/wp-content/uploads/2018/11/front-labelled.jpgFront labelledFigure 5: Front view, showing mirrorshttps://sextantbook.com/wp-content/uploads/2018/11/calibration1-e1543267749132.jpgCalibrationFigure 4: Calibration record.https://sextantbook.com/wp-content/uploads/2018/11/integrator1-e1543267431122.jpgIntegratorFigure 3: Integrator mechanism.https://sextantbook.com/wp-content/uploads/2018/11/rear.jpgRearFigure 1: Rear view of Mk IX A and HMBS sextantshttps://sextantbook.com/wp-content/uploads/2018/11/lh-side.jpgLH sideFigure 2: LHS of Mk IX A and HMBS sextants.2018-11-26T22:12:37+00:00monthlyhttps://sextantbook.com/2014/06/29/a-half-size-sextant-by-lefebvre-poulin/https://sextantbook.com/wp-content/uploads/2014/06/box.jpgBoxFigure 11: Interior of case (courtesy of M. H Le Bot)https://sextantbook.com/wp-content/uploads/2014/06/handle.jpgHandleFigure 4: To show handle.https://sextantbook.com/wp-content/uploads/2014/06/worm-ga.jpgWorm GAFigure 8: Micrometer mechanism.https://sextantbook.com/wp-content/uploads/2014/06/rack.jpgOLYMPUS DIGITAL CAMERAFigure 7: To show the rack.https://sextantbook.com/wp-content/uploads/2014/06/rack-detail.jpgRack detailhttps://sextantbook.com/wp-content/uploads/2014/06/main-scale.jpgOLYMPUS DIGITAL CAMERAFigure 10: Main scale close-up view.https://sextantbook.com/wp-content/uploads/2014/06/index-exploded.jpgindex explodedFigure 6: Exploded index arm bearing.https://sextantbook.com/wp-content/uploads/2014/06/index-bearing.jpgIndex bearingFigure 5: Index arm bearing, and handle attachment.https://sextantbook.com/wp-content/uploads/2014/06/ga2-labelled.jpgGA2 labelledFigure 3: Main parts of the sextant.https://sextantbook.com/wp-content/uploads/2014/06/ga1-rear.jpgGA1 rearFigure 2: General arrangement, rear view.2018-11-22T21:10:39+00:00monthlyhttps://sextantbook.com/2015/08/11/a-turn-of-the-century-french-sextant/https://sextantbook.com/wp-content/uploads/2015/08/index-mirror-bracket1.jpgIndex mirror bracketFigure: https://sextantbook.com/wp-content/uploads/2015/08/telescopes-001.jpgTelescopes 001Figure 14: Sighting devices.https://sextantbook.com/wp-content/uploads/2015/08/horizon-mirror-locks-001.jpgHorizon mirror locks 001Figure 8: Horizon mirror locking screws.https://sextantbook.com/wp-content/uploads/2015/08/copy-of-horizon-mirror-axis-2.jpgCopy of Horizon mirror axis 2Figure 7: Horizon mirror bracket and clamp.https://sextantbook.com/wp-content/uploads/2015/08/telescope-mouniting.jpgTelescope mounitingFigure 10: Exploded view of telescope mounting.https://sextantbook.com/wp-content/uploads/2015/08/telescope-bracket-in-situ.jpgTelescope bracket in situFigure 9:mounting of telescope rising piece.https://sextantbook.com/wp-content/uploads/2015/08/tangent-screw.jpgTangent screwFigure 12: Tangent screw bearing.https://sextantbook.com/wp-content/uploads/2015/08/tangent-screw-3.jpgTangent screw 3Figure 13: Underside of sliding blockhttps://sextantbook.com/wp-content/uploads/2015/08/tangent-screw-2.jpgTangent screw 2Figure 11: General view of tangent screw mechanism.https://sextantbook.com/wp-content/uploads/2015/08/restored-in-case.jpgRestored in caseFigure 17: Restored instrument in its case.2018-11-22T21:09:12+00:00monthlyhttps://sextantbook.com/2018/11/17/another-sounding-sextant/https://sextantbook.com/wp-content/uploads/2018/11/in-case.jpgIn caseFigure 8: Instrument in its casehttps://sextantbook.com/wp-content/uploads/2018/11/case-corner.jpgCase cornerFigure 7: Keyed mitre joint in case.https://sextantbook.com/wp-content/uploads/2018/11/calibration.jpgCalibrationFigure 4: Position of prism to check index error.https://sextantbook.com/wp-content/uploads/2018/11/90-degrees.jpg90 degreesFigure 6: 90 + 90 degrees = 180 degrees.https://sextantbook.com/wp-content/uploads/2018/11/30-degrees.jpg30 degreesFigure 5: 90 + 30 degrees = 120 degrees.https://sextantbook.com/wp-content/uploads/2018/11/pentaprism-base.jpgPentaprism baseFigure 3: Pentaprism basehttps://sextantbook.com/wp-content/uploads/2018/11/c-and-p-sounding-sextant-002.jpgOLYMPUS DIGITAL CAMERAFigure 2: Position of the pentaprism.https://sextantbook.com/wp-content/uploads/2018/11/c-and-p-sounding-sextant-004.jpgOLYMPUS DIGITAL CAMERAFigure 2: Pentaprism in position.https://sextantbook.com/wp-content/uploads/2018/11/as-found-labelled.jpgAs found labelledFigure 1: C & P Sounding sextant as found.2018-11-17T02:58:53+00:00monthlyhttps://sextantbook.com/2011/01/27/a12-bubble-sextant-restoration-manual/2018-10-10T21:04:04+00:00monthlyhttps://sextantbook.com/2018/09/17/a-c18-sextant-named-j-watkins/https://sextantbook.com/wp-content/uploads/2018/09/case-002.jpgCase 002Figure 14: Sextant in new home.https://sextantbook.com/wp-content/uploads/2018/08/telescope-rising.jpgTelescope risingFigure 5: Telescope ring.https://sextantbook.com/wp-content/uploads/2018/08/telescope-in-situ.jpgTelescope in situhttps://sextantbook.com/wp-content/uploads/2018/08/tangent-screw.jpgTangent screwFigure 9: Tangent screw.https://sextantbook.com/wp-content/uploads/2018/08/scales.jpgOLYMPUS DIGITAL CAMERAOLYMPUS DIGITAL CAMERAhttps://sextantbook.com/wp-content/uploads/2018/08/scales-labelled.jpgScales labelledhttps://sextantbook.com/wp-content/uploads/2018/08/scale-divisions.jpgScale divisionsFigure 3: Magnified view of scale divisions.https://sextantbook.com/wp-content/uploads/2018/08/name.jpgNameFigure 2: The name.https://sextantbook.com/wp-content/uploads/2018/08/long-s.jpgLong sFigure 4a.https://sextantbook.com/wp-content/uploads/2018/08/jeremiah-watkins-022.jpgOLYMPUS DIGITAL CAMERAOLYMPUS DIGITAL CAMERA2018-09-19T15:39:55+00:00monthlyhttps://sextantbook.com/2018/03/14/a-later-shackman-sextant-a-guest-blog-post/https://sextantbook.com/wp-content/uploads/2018/03/copy-of-img_3140_preview.jpegCopy of IMG_3140_previewFigure 4: Strange pre-load spring to index arm bearing.https://sextantbook.com/wp-content/uploads/2018/03/copy-of-img_3294_preview.jpegCopy of IMG_3294_previewFigure 3: Radial helical pre-load spring.https://sextantbook.com/wp-content/uploads/2018/03/copy-of-img_3295_preview.jpegCopy of IMG_3295_previewFigure 2: Damage to release catch "paddle".https://sextantbook.com/wp-content/uploads/2018/03/img_3302_preview.jpegIMG_3302_previewFigure 4:Shoddy workmanship.https://sextantbook.com/wp-content/uploads/2018/03/img_3296_preview.jpegIMG_3296_previewhttps://sextantbook.com/wp-content/uploads/2018/03/img_3143_preview.jpegIMG_3143_previewFigure 1: The sextant sitting on its case.https://sextantbook.com/wp-content/uploads/2018/03/img_3142_preview.jpegIMG_3142_previewhttps://sextantbook.com/wp-content/uploads/2018/03/img_3141_preview.jpegIMG_3141_preview2018-06-09T00:11:10+00:00monthlyhttps://sextantbook.com/2009/02/25/bubble-sextant-restoration-manuals/https://sextantbook.com/wp-content/uploads/2009/02/finger.jpgfingerhttps://sextantbook.com/wp-content/uploads/2009/02/rem-bearing-plate.jpgrem-bearing-plate2018-04-04T00:06:22+00:00monthlyhttps://sextantbook.com/2014/04/24/the-observator-mark-4-sextant/https://sextantbook.com/wp-content/uploads/2014/04/stowage.jpgOLYMPUS DIGITAL CAMERAFigure 12: Sextant stowed in its case.https://sextantbook.com/wp-content/uploads/2014/04/worm-exploded.jpgWorm explodedFigure 11: Micrometer mechanism detailshttps://sextantbook.com/wp-content/uploads/2014/04/micrometer-labelled.jpgMicrometer labelledFigure 10: Micrometer mechanism removed from index arm.https://sextantbook.com/wp-content/uploads/2014/04/filter-detail.jpgFilter detailFigure 8: Details of shade mounting.https://sextantbook.com/wp-content/uploads/2014/04/tescope-dia-plus-objective.jpgTescope dia plus objectiveFigure 7: Central axial diaphragm of telescope.https://sextantbook.com/wp-content/uploads/2014/04/telescope-focus.jpgTelescope focusFigure 9: Focusing mechanism of telescope.https://sextantbook.com/wp-content/uploads/2014/04/telescope-front.jpgTelescope fronthttps://sextantbook.com/wp-content/uploads/2014/04/telescope-section.jpgTelescope sectionhttps://sextantbook.com/wp-content/uploads/2014/04/index-arm-bearing-labelled.jpgIndex arm bearing labelledFigure 4: The index arm bearing parts.https://sextantbook.com/wp-content/uploads/2014/04/horizon-mirror.jpgHorizon mirrorFigure 5: Horizon mirror and bracket.2018-02-21T03:33:47+00:00monthlyhttps://sextantbook.com/2018/02/14/hughes-and-son-admiralty-pattern-micrometer-sextant/https://sextantbook.com/wp-content/uploads/2018/02/a8-latches.jpgA8 latchesFigure 10: Hook latches in closed position.https://sextantbook.com/wp-content/uploads/2018/02/a7-in-box.jpgA7 in boxFigure 9: The sextant in its case.https://sextantbook.com/wp-content/uploads/2018/02/a5-telescope-hood.jpgA5 telescope hoodFigure 8: Telescope hood.https://sextantbook.com/wp-content/uploads/2018/02/a6-telescopes-etc.jpgA6 telescopes etcFigure 7: Ancillaries.https://sextantbook.com/wp-content/uploads/2018/02/a4-micrometer-front.jpgA4 micrometer frontFigure 5: More micrometer details.https://sextantbook.com/wp-content/uploads/2018/02/a3-micrometer-detail.jpgA3 micrometer detailFigure 4: Details of micrometer mechanism.https://sextantbook.com/wp-content/uploads/2018/02/a2-ga-back.jpgA2 GA backFigure 3: Rear view of restored sextant.https://sextantbook.com/wp-content/uploads/2018/02/a-1-ga-front.jpgA 1 GA frontFigure 2: Front view of restored sextant.https://sextantbook.com/wp-content/uploads/2018/02/as-bought.jpgAs boughtFigure 1: As bought.2018-02-15T06:57:58+00:00monthlyhttps://sextantbook.com/buy-the-book/download/2018-02-07T18:02:44+00:00weekly0.6https://sextantbook.com/2008/11/22/the-ussr-sno-t-sextant/https://sextantbook.com/wp-content/uploads/2008/11/sewil-cetus-prima-clearview.jpgSewil Cetus Prima clearviewSewill Cetus Primus "clear-view" mirror with Davis prism attachment.https://sextantbook.com/wp-content/uploads/2008/11/sewil-cetus-prima-vernier.jpgSewil Cetus Prima vernierFigure : Sewill Cetus Primus micrometer vernierhttps://sextantbook.com/wp-content/uploads/2008/11/sno-t-serv-micrometer-5.jpgSNO-T serv micrometer 5https://sextantbook.com/wp-content/uploads/2008/11/sno-t-serv-index-shade-3.jpgSNO-T serv index shade 3https://sextantbook.com/wp-content/uploads/2008/11/sno-t-manual-058.jpgOLYMPUS DIGITAL CAMERAhttps://sextantbook.com/wp-content/uploads/2008/11/untitled.pngUntitledhttps://sextantbook.com/wp-content/uploads/2008/11/sno-t-rear.jpgsno-t-rearhttps://sextantbook.com/wp-content/uploads/2008/11/sno-t-front.jpgsno-t-front2018-12-14T22:57:40+00:00monthlyhttps://sextantbook.com/2010/11/30/usn-buships-mark-ii-sextant-some-design-oddities/https://sextantbook.com/wp-content/uploads/2010/11/mk-ii-telescope-layout11.jpgmk-ii-telescope-layout1https://sextantbook.com/wp-content/uploads/2010/11/cases-0021.jpgCases 002From top to bottom cases by Bendix, Ajax and White, three-quarter viewhttps://sextantbook.com/wp-content/uploads/2010/11/cases-002.jpgCases 002https://sextantbook.com/wp-content/uploads/2010/11/cases-001.jpgCases 001From top to bottom, cases by Bendix, Ajax and White, front viewhttps://sextantbook.com/wp-content/uploads/2010/11/mk-ii-horizon-mirror.jpgMk II horizon mirrorFigure 9 : Mark II horizon mirror adjustment.https://sextantbook.com/wp-content/uploads/2010/11/pioneer-bendix-microm-layout.jpgPioneer bendix microm layoutFigure 3 : Pioneer-Bendix micrometer mechanismhttps://sextantbook.com/wp-content/uploads/2010/11/mk-ii-focussing-assy.jpgMk II Focussing assyFigure 8: Mark II sextant telescope eyepiece assemblyhttps://sextantbook.com/wp-content/uploads/2010/11/a12-050.jpgA12 050Figure 5: Mark II sextant telescope exteriorhttps://sextantbook.com/wp-content/uploads/2010/11/copy-of-david-white-micrometer.jpgCopy of David white micrometerFigure 4; Layout of David White micrometer mechanismhttps://sextantbook.com/wp-content/uploads/2010/11/mk-ii-ga.jpgMk II GAFigure 7 : General construction of Mark II sextant telescope2017-07-15T00:14:17+00:00monthlyhttps://sextantbook.com/2013/11/04/the-sold-km2-bubble-sextant/https://sextantbook.com/wp-content/uploads/2013/11/sold-mirror.jpgSOLD mirrorFigure 28 : Night lighting mirror dimensions.https://sextantbook.com/wp-content/uploads/2013/11/wolfgang-sold-002.jpgWolfgang sold 002Figure 27 : Access to first mirror.https://sextantbook.com/wp-content/uploads/2013/11/sold-luehmann-instructions.jpgSold Luehmann instructionsFigure A3: Instructions in lid.https://sextantbook.com/wp-content/uploads/2013/11/sold-luehmann-in-case.jpgSold Luehmann in caseFigure A2: Luftwaffe instrument in case.https://sextantbook.com/wp-content/uploads/2013/11/sold-luehmann-case-ext.jpgSold Luehmann case extFigure A1: Exterior of wooden case.https://sextantbook.com/wp-content/uploads/2013/11/integrator-lamp-001.jpgIntegrator lamp 001Figure 17 a: Integrator lamphttps://sextantbook.com/wp-content/uploads/2013/11/sold-fig-8.jpgSOLD fig 8https://sextantbook.com/wp-content/uploads/2013/11/case-interior-3.jpgCase interior 3Figure 27: Contents of case.https://sextantbook.com/wp-content/uploads/2013/11/case-interior-2.jpgCase interior 2https://sextantbook.com/wp-content/uploads/2013/11/case-exterior.jpgCase exteriorFigure 25: Exterior of case.2017-06-02T02:04:18+00:00monthlyhttps://sextantbook.com/2012/11/13/eighty-years-of-carl-plath-sextants/https://sextantbook.com/wp-content/uploads/2012/11/navistar-astigmatising-scope.jpgNavistar astigmatising scopeFigure 22: Astigmatising telescope.https://sextantbook.com/wp-content/uploads/2012/11/navistar-lighting.jpgNavistar lightinghttps://sextantbook.com/wp-content/uploads/2012/11/navistar-micrometer-mechanism.jpgNavistar micrometer mechanismFigure 20: Micrometer mechanism of Navistar professional.https://sextantbook.com/wp-content/uploads/2012/11/bearing.jpgBearingFigure 19: Index arm bearing.https://sextantbook.com/wp-content/uploads/2012/11/shades.jpgShadesFigure 18: Horizon and index shades.https://sextantbook.com/wp-content/uploads/2012/11/micrometer.jpgMicrometerFigure 17: Micrometer drum and arc.https://sextantbook.com/wp-content/uploads/2012/11/navistar-007.jpgNavistar 007Figure 16: Navistar Professional in its case, rear view.https://sextantbook.com/wp-content/uploads/2012/11/ga.jpgGAFigure 15: Front view of Navistar Professional sextant.https://sextantbook.com/wp-content/uploads/2012/11/latch.jpgLatchFigure 14: Retaining latch and pocket of Navistar sextanthttps://sextantbook.com/wp-content/uploads/2012/11/case-1.jpgCase 1Figure : Case of Navistar sextant2017-04-29T09:45:14+00:00monthlyhttps://sextantbook.com/2017/04/20/carl-plaths-earliest-sextant/https://sextantbook.com/wp-content/uploads/2017/04/cat-photo-001.jpgCat photo 001https://sextantbook.com/wp-content/uploads/2017/04/serial-and-s1.jpgSerial and Shttps://sextantbook.com/wp-content/uploads/2017/04/rising-piece.jpgRising piecehttps://sextantbook.com/wp-content/uploads/2017/04/telescope-kit.jpgTelescope kithttps://sextantbook.com/wp-content/uploads/2017/04/tangent-screw.jpgTangent screwhttps://sextantbook.com/wp-content/uploads/2017/04/tangent-screw-exploded.jpgTangent screw explodedhttps://sextantbook.com/wp-content/uploads/2017/04/serial-and-s.jpgSerial and Shttps://sextantbook.com/wp-content/uploads/2017/04/interior-restored.jpgInterior restoredhttps://sextantbook.com/wp-content/uploads/2017/04/arc-and-name.jpgArc and namehttps://sextantbook.com/wp-content/uploads/2017/04/case-restored.jpgCase restored2017-04-28T07:59:26+00:00monthlyhttps://sextantbook.com/2008/12/02/unusual-left-handed-sextant/https://sextantbook.com/wp-content/uploads/2008/12/mki-handle1.jpgMkI handlehttps://sextantbook.com/wp-content/uploads/2008/12/mki-handle.jpgMkI handlehttps://sextantbook.com/wp-content/uploads/2008/12/case1.jpgcase1https://sextantbook.com/wp-content/uploads/2008/12/micrometer1.jpgmicrometer1https://sextantbook.com/wp-content/uploads/2008/12/micrometer.jpgmicrometerhttps://sextantbook.com/wp-content/uploads/2008/12/front.jpgfronthttps://sextantbook.com/wp-content/uploads/2008/12/case.jpgcase2017-02-06T02:55:56+00:00monthlyhttps://sextantbook.com/2016/10/20/a-battered-observator-sextant/https://sextantbook.com/wp-content/uploads/2016/10/handle-1.jpghandle-1Figure Rear face of finished instrument.https://sextantbook.com/wp-content/uploads/2016/10/copy-of-swing-arm-structure.jpgcopy-of-swing-arm-structureFigure: Soldering jig.https://sextantbook.com/wp-content/uploads/2016/10/ga-finished.jpgga-finishedFigure 14: Finished sextant in its casehttps://sextantbook.com/wp-content/uploads/2016/10/ga.jpggaFrontispiece: Before.https://sextantbook.com/wp-content/uploads/2016/10/broken-shades-screw.jpgOLYMPUS DIGITAL CAMERAFigure 12: Broken screwhttps://sextantbook.com/wp-content/uploads/2016/10/soldering-jig.jpgOLYMPUS DIGITAL CAMERAFigure 12: Soldering jig in place.https://sextantbook.com/wp-content/uploads/2016/10/swing-arm-structure.jpgOLYMPUS DIGITAL CAMERAFigure 11: Soldering jig.https://sextantbook.com/wp-content/uploads/2016/10/shaft-straighten.jpgshaft-straightenFigure 9: Straightening the shaft under control.https://sextantbook.com/wp-content/uploads/2016/10/micrometer-shaft-0032.jpgmicrometer-shaft-003Figure 9: Swings arm and trunnion.https://sextantbook.com/wp-content/uploads/2016/10/micrometer-shaft-0012.jpgmicrometer-shaft-001Figure 8: Micrometer shaft in its bearings2016-12-12T02:45:37+00:00monthlyhttps://sextantbook.com/2014/12/23/an-improvised-sun-compass/https://sextantbook.com/wp-content/uploads/2014/12/my-copass-ga-right.jpgMy copass GA rightFigure 4: View of instrument from right and above.https://sextantbook.com/wp-content/uploads/2014/12/my-compass-ga-left.jpgMy compass GA leftFigure 3: Face of clock.https://sextantbook.com/wp-content/uploads/2014/12/my-compass-ga-front.jpgMy compass GA frontFigure 2: General arrangement from above left.https://sextantbook.com/wp-content/uploads/2014/12/my-compas-dial.jpgMy compas dialFigure 1: 24 hour reversed dial.2016-11-12T19:45:52+00:00monthlyhttps://sextantbook.com/2010/01/07/a-box-sextant/https://sextantbook.com/wp-content/uploads/2010/01/scales-001.jpgScales 001https://sextantbook.com/wp-content/uploads/2010/01/in-use.jpgIn usehttps://sextantbook.com/wp-content/uploads/2010/01/100_3353.jpg100_3353https://sextantbook.com/wp-content/uploads/2010/01/big-brother.jpgBig brotherhttps://sextantbook.com/wp-content/uploads/2010/01/interior2.jpgInterior2https://sextantbook.com/wp-content/uploads/2010/01/interior.jpgInteriorhttps://sextantbook.com/wp-content/uploads/2010/01/controls.jpgControlshttps://sextantbook.com/wp-content/uploads/2010/01/ga1.jpgGAhttps://sextantbook.com/wp-content/uploads/2010/01/ga.jpgGAhttps://sextantbook.com/wp-content/uploads/2010/01/base.jpgBase2016-11-11T21:20:30+00:00monthlyhttps://sextantbook.com/2016/10/20/a-battered-1940s-observator-sextant/2016-10-20T07:19:23+00:00monthlyhttps://sextantbook.com/2016/10/08/replacing-the-pellicle-of-an-ma1-sextant/https://sextantbook.com/wp-content/uploads/2016/10/pellicle-renewal-006.jpgpellicle-renewal-006Figure 6: View through eyepiece, using cover slip as semi-reflective mirror.https://sextantbook.com/wp-content/uploads/2016/10/pellicle-renewal-004.jpgpellicle-renewal-004Figure 5: Replace pellicle with cover slip.https://sextantbook.com/wp-content/uploads/2016/10/pellicle-renewal-003.jpgpellicle-renewal-003Figure 4: Remove pellicle frame.https://sextantbook.com/wp-content/uploads/2016/10/pellicle-renewal-002.jpgpellicle-renewal-002Figure 3: Remove left cover.https://sextantbook.com/wp-content/uploads/2016/10/pellicle-renewal-001.jpgpellicle-renewal-001Figure 2: Remove dessicator.https://sextantbook.com/wp-content/uploads/2016/10/light-path.jpglight-pathFigure 1: MA1 light path diagram.2016-10-08T04:38:01+00:00monthlyhttps://sextantbook.com/2016/10/07/mending-broken-legs/https://sextantbook.com/wp-content/uploads/2016/10/leg-mend-6.jpgleg-mend-6Figure 7: New male thread inserted.https://sextantbook.com/wp-content/uploads/2016/10/leg-mend-5.jpgleg-mend-5Figure 6: Female thread liberated.https://sextantbook.com/wp-content/uploads/2016/10/leg-mend-4.jpgleg-mend-4Figure 5: Fine drilling.https://sextantbook.com/wp-content/uploads/2016/10/leg-mend-3.jpgleg-mend-3Figure 4: Enlarging the centre pophttps://sextantbook.com/wp-content/uploads/2016/10/leg-mend-2.jpgleg-mend-2Figure 3: Deepening the centrehttps://sextantbook.com/wp-content/uploads/2016/10/leg-mend-1.jpgleg-mend-1Figure 2: Marking the centre.https://sextantbook.com/wp-content/uploads/2016/10/leg-1.jpgleg-1 Figure 1: Broken leg as found2016-10-07T03:11:42+00:00monthlyhttps://sextantbook.com/2016/02/17/a-francis-barker-yachting-sextant/https://sextantbook.com/wp-content/uploads/2016/02/adjusting-screws1.jpgAdjusting screwshttps://sextantbook.com/wp-content/uploads/2016/02/scales.jpgScalesFigure 12: The scales.https://sextantbook.com/wp-content/uploads/2016/02/adjusting-screws.jpgAdjusting screwsFigure 10: Heads of adjusting screws.https://sextantbook.com/wp-content/uploads/2016/02/horizon-mirror-adj.jpgHorizon mirror adjFigure 9: Horizon mirror adjustments.https://sextantbook.com/wp-content/uploads/2016/02/index-mirror-mount.jpgIndex mirror mountFigure 8: Index mirror mounting and adjustments.https://sextantbook.com/wp-content/uploads/2016/02/perp-adjust.jpgPerp adjustFigure 8: Aligning index mirror for perpendicularity.https://sextantbook.com/wp-content/uploads/2016/02/ga-internal.jpgGA internalFigure 6; General internal arrangement.https://sextantbook.com/wp-content/uploads/2016/02/shades.jpgShadesFigure 5: Horizon shades.https://sextantbook.com/wp-content/uploads/2016/02/ga-with-sights.jpgGA with sightsFigure 4: Peep sights and shades.https://sextantbook.com/wp-content/uploads/2016/02/ga.jpgGAFigure 3: General arrangement.2016-10-07T02:46:49+00:00monthlyhttps://sextantbook.com/2010/12/18/carl-plath-micrometer-sextant/https://sextantbook.com/wp-content/uploads/2010/12/completed.jpgOLYMPUS DIGITAL CAMERAFigure 14 : Restored sextant in casehttps://sextantbook.com/wp-content/uploads/2010/12/mirror-cut.jpgMirror cutFigure 13 : De-silvering horizon mirrorhttps://sextantbook.com/wp-content/uploads/2010/12/machining-rising-piece.jpgMachining rising pieceFigure 12 : Machining the rising piecehttps://sextantbook.com/wp-content/uploads/2010/12/threading.jpgThreadingFigure 11 : Cutting new internal threadhttps://sextantbook.com/wp-content/uploads/2010/12/scope-before-and-after.jpgScope before and afterhttps://sextantbook.com/wp-content/uploads/2010/12/plath-switch1.jpgPlath switchFigure 9 : Sketch of switch constructionhttps://sextantbook.com/wp-content/uploads/2010/12/plath-switch.jpgPlath switchFigure 9; Sketch of lighting switchhttps://sextantbook.com/wp-content/uploads/2010/12/shade-mount-1.jpgShade mount 1Figure 8 : Shade friction adjustmenthttps://sextantbook.com/wp-content/uploads/2010/12/shade-mount-2.jpgShade mount 2Figure 7 : Mounting of shadeshttps://sextantbook.com/wp-content/uploads/2010/12/micrometer-exploded.jpgMicrometer explodedFigure 6 : Micrometer emchanism exploded2016-07-02T23:40:19+00:00monthlyhttps://sextantbook.com/2016/05/06/a-coutinho-pattern-bubble-sextant/https://sextantbook.com/wp-content/uploads/2016/05/1-case-exterior1.jpg1 Case exteriorFigure 21: Exterior of case.https://sextantbook.com/wp-content/uploads/2016/05/2962-008.jpg2962 008Figure 19: Maker's placard.https://sextantbook.com/wp-content/uploads/2016/05/18-pot.jpg18 PotFigure 19: Interior of potentiometer.https://sextantbook.com/wp-content/uploads/2016/05/19-pot-exterior.jpg19 Pot exteriorFigure 18: Potentiometer knob and power socket.https://sextantbook.com/wp-content/uploads/2016/05/lighting-system-002.jpgLighting system 002Figure 16: Level lighting.https://sextantbook.com/wp-content/uploads/2016/05/lighting-system-001.jpgLighting system 001Figure 16: Battery handle.https://sextantbook.com/wp-content/uploads/2016/05/16-scale-lighting.jpg16 Scale lightingFigure: Scale lighting.https://sextantbook.com/wp-content/uploads/2016/05/15-a-combined-peep.jpg15 a Combined peepFigure 13: Peep sight apertures.https://sextantbook.com/wp-content/uploads/2016/05/13-peep-sights-side.jpg13 Peep sights sideFigure 12: Peep sights in holder.https://sextantbook.com/wp-content/uploads/2016/05/scope-sife-view-001.jpgScope sife view 001Figure 10: Telescope for use with artificial horizon.2016-05-20T12:26:37+00:00monthlyhttps://sextantbook.com/2010/01/24/restoring-a-c-platt-drei-kreis-sextant/https://sextantbook.com/wp-content/uploads/2010/01/100_3359.jpg100_3359https://sextantbook.com/wp-content/uploads/2010/01/homonunculus.jpgHomonunculushttps://sextantbook.com/wp-content/uploads/2010/01/100_3372.jpg100_3372https://sextantbook.com/wp-content/uploads/2010/01/100_3374.jpg100_3374https://sextantbook.com/wp-content/uploads/2010/01/100_33752.jpg100_3375https://sextantbook.com/wp-content/uploads/2010/01/100_33751.jpg100_3375https://sextantbook.com/wp-content/uploads/2010/01/100_3375.jpg100_3375https://sextantbook.com/wp-content/uploads/2010/01/rearview.jpgRearviewhttps://sextantbook.com/wp-content/uploads/2010/01/100_3360.jpg100_3360https://sextantbook.com/wp-content/uploads/2010/01/rise-and-fall.jpgRise and fall2016-04-24T04:35:15+00:00monthlyhttps://sextantbook.com/2008/12/20/overhaul-of-mk-v-an5851-sextant-bubble-chamber/https://sextantbook.com/wp-content/uploads/2008/12/jig.jpgjighttps://sextantbook.com/wp-content/uploads/2008/12/100_2216.jpg100_2216https://sextantbook.com/wp-content/uploads/2008/12/100_2219.jpg100_2219https://sextantbook.com/wp-content/uploads/2008/12/lenses-out.jpglenses-outhttps://sextantbook.com/wp-content/uploads/2008/12/luminous-annulus.jpgluminous-annulushttps://sextantbook.com/wp-content/uploads/2008/12/dis-assembled-bubble.jpgdis-assembled-bubble2016-04-07T20:31:25+00:00monthlyhttps://sextantbook.com/2008/12/09/bubble-illumination-of-mk-v-and-an-5851-bubble-sextants/https://sextantbook.com/wp-content/uploads/2008/12/step-two.jpgstep-twohttps://sextantbook.com/wp-content/uploads/2008/12/step-one.jpgstep-one2016-04-07T20:25:39+00:00monthlyhttps://sextantbook.com/2014/09/13/how-to-refill-c-plath-bubble-artificial-horizon/https://sextantbook.com/wp-content/uploads/2014/09/copy-of-plath-bubble-refill-012.jpgCopy of Plath bubble refill 012This should be as big as it gets.https://sextantbook.com/wp-content/uploads/2014/09/copy-of-plath-bubble-refill-011.jpgCopy of Plath bubble refill 011Figure 10: Form bubble.https://sextantbook.com/wp-content/uploads/2014/09/copy-of-plath-bubble-refill-009.jpgCopy of Plath bubble refill 009Figure 9: Rinse and add fluid as necessary.https://sextantbook.com/wp-content/uploads/2014/09/copy-of-plath-bubble-refill-008.jpgCopy of Plath bubble refill 008Figure 8: Prise out glass, even more carefully. https://sextantbook.com/wp-content/uploads/2014/09/copy-of-plath-bubble-refill-007.jpgCopy of Plath bubble refill 007Figure 7: Remove another washer, carefully.https://sextantbook.com/wp-content/uploads/2014/09/copy-of-plath-bubble-refill-006.jpgCopy of Plath bubble refill 006Figure 6: Remove washer. https://sextantbook.com/wp-content/uploads/2014/09/copy-of-plath-bubble-refill-005.jpgCopy of Plath bubble refill 005Figure 5: Remove top retaining ring.https://sextantbook.com/wp-content/uploads/2014/09/copy-of-plath-bubble-refill-004.jpgCopy of Plath bubble refill 004Figure 4: Remove bubble unit. https://sextantbook.com/wp-content/uploads/2014/09/copy-of-plath-bubble-refill-003.jpgCopy of Plath bubble refill 003Figure 3:https://sextantbook.com/wp-content/uploads/2014/09/copy-of-plath-bubble-refill-002.jpgCopy of Plath bubble refill 002Figure 2: Remove lamp holder.2016-03-24T18:30:45+00:00monthlyhttps://sextantbook.com/2014/10/01/ilon-industries-mark-iii-sextant/https://sextantbook.com/wp-content/uploads/2014/10/5a-shades.jpg5a ShadesFigure 7: Shades and mirrors.https://sextantbook.com/wp-content/uploads/2014/10/0-case.jpg0 CaseFigure 1: Casehttps://sextantbook.com/wp-content/uploads/2014/10/11-micrometer-detail.jpg11 Micrometer detailFigure 9: Detail of micrometer mechanism.https://sextantbook.com/wp-content/uploads/2014/10/10-h-mirror-adjustments.jpg10 H mirror adjustmentsFigure 13: Horizon mirror adjustment.https://sextantbook.com/wp-content/uploads/2014/10/9-mirror-bracket-slots.jpg9 Mirror bracket slotsFigure 12: Detail of horizon mirror bracket.https://sextantbook.com/wp-content/uploads/2014/10/8-light-path.jpg8 Light pathFigure 10: Light path.https://sextantbook.com/wp-content/uploads/2014/10/7-micrometer-index.jpg7 Micrometer indexFigure 9: Micrometer index.https://sextantbook.com/wp-content/uploads/2014/10/6-micrometer-parts.jpg6 Micrometer partsFigure 8: Micrometer mechanism.https://sextantbook.com/wp-content/uploads/2014/10/5-handle-fitted.jpg5 Handle fittedFigure 6: Handle locked into place.https://sextantbook.com/wp-content/uploads/2014/10/4-handle-fitting.jpg4 Handle fittingFigure 5: Sockets for handle.2016-05-07T22:11:04+00:00monthlyhttps://sextantbook.com/2011/09/29/a-half-size-sextant-by-hughes-and-son/https://sextantbook.com/wp-content/uploads/2011/09/heath-seaplane.jpgHeath seaplaneFigure 11 : Heath and Co. seaplane sextant.https://sextantbook.com/wp-content/uploads/2011/09/index-shades1.jpgOLYMPUS DIGITAL CAMERAFigure 8 : Index shades mountinghttps://sextantbook.com/wp-content/uploads/2011/09/005-11.jpgOLYMPUS DIGITAL CAMERAFigure 10 : Bare frame.https://sextantbook.com/wp-content/uploads/2011/09/005-1.jpgOLYMPUS DIGITAL CAMERAhttps://sextantbook.com/wp-content/uploads/2011/09/horizon-shades.jpgOLYMPUS DIGITAL CAMERAFigure 9 : Horizon shades mounting.https://sextantbook.com/wp-content/uploads/2011/09/index-shades.jpgOLYMPUS DIGITAL CAMERAFigure 8 : Method of mounting index shades.https://sextantbook.com/wp-content/uploads/2011/09/micrometer-mechanism.jpgOLYMPUS DIGITAL CAMERAFigure 7 : Micrometer mechanism.https://sextantbook.com/wp-content/uploads/2011/09/018-1.jpgOLYMPUS DIGITAL CAMERAFigure 4 : Location of telescope in frame.https://sextantbook.com/wp-content/uploads/2011/09/017-1.jpgOLYMPUS DIGITAL CAMERAFigure 6 : Method of locating handle.https://sextantbook.com/wp-content/uploads/2011/09/020-1.jpgOLYMPUS DIGITAL CAMERAFigure 5 : Rear (right hand) view of sextant.2016-02-11T03:01:20+00:00monthlyhttps://sextantbook.com/2009/05/30/a-byrd-sextant-restored/https://sextantbook.com/wp-content/uploads/2009/05/byrd-handle1.jpgByrd handlehttps://sextantbook.com/wp-content/uploads/2009/05/byrd-handle.jpgByrd handlehttps://sextantbook.com/wp-content/uploads/2009/05/100_2802.jpg100_2802https://sextantbook.com/wp-content/uploads/2009/05/100_27921.jpg100_2792https://sextantbook.com/wp-content/uploads/2009/05/100_2792.jpg100_2792https://sextantbook.com/wp-content/uploads/2009/05/100_2796.jpg100_2796https://sextantbook.com/wp-content/uploads/2009/05/100_2772.jpg100_2772https://sextantbook.com/wp-content/uploads/2009/05/almirante_richard_e__byrd.jpgAlmirante_Richard_E__Byrd2015-09-11T07:06:08+00:00monthlyhttps://sextantbook.com/2011/06/24/freiberger-yacht-sextant/https://sextantbook.com/wp-content/uploads/2011/06/horizon-shades-002.jpgHorizon shades 002Figure 9 : Horizon shades assembly.https://sextantbook.com/wp-content/uploads/2011/06/yacht-tool.jpgYacht toolFigure 9 : Adjusting screw and tool.https://sextantbook.com/wp-content/uploads/2011/06/yacht-index-shades.jpgYacht index shadesFigure 8 : Mounting of index shades https://sextantbook.com/wp-content/uploads/2011/06/yacht-sextant-011.jpgOLYMPUS DIGITAL CAMERAFigure 7 : Swing arm details.https://sextantbook.com/wp-content/uploads/2011/06/yacht-worm.jpgYacht wormFigure 6 : Swing arm from above.https://sextantbook.com/wp-content/uploads/2011/06/yacht-release-catch.jpgYacht release catchFigure 5 : Worm enclosurehttps://sextantbook.com/wp-content/uploads/2011/06/yacht-sextant-013.jpgYacht sextant 013Figure 4 : Index arm bearing details.https://sextantbook.com/wp-content/uploads/2011/06/yacht-inde-arm-1.jpgYacht inde arm 1Figure 3 : A cornucopia of screws.https://sextantbook.com/wp-content/uploads/2011/06/yacht-sextant-002.jpgYacht sextant 002Figure 2 : Rear view of Yacht sextanthttps://sextantbook.com/wp-content/uploads/2011/06/yacht-sextant-001.jpgYacht sextant 001Figure 1 : Front view of Yacht sextant.2018-02-04T14:39:21+00:00monthlyhttps://sextantbook.com/2015/06/14/c-plath-yachting-sextant/https://sextantbook.com/wp-content/uploads/2015/06/swing-arm-bearings.jpgSwing arm bearingsFigure : Swing arm bearings.https://sextantbook.com/wp-content/uploads/2015/06/plath-yachting-sextant-0101.jpgOLYMPUS DIGITAL CAMERAFigure : Front plate removed to show interior of micrometer mechanism.https://sextantbook.com/wp-content/uploads/2015/06/plath-yachting-sextant-009.jpgOLYMPUS DIGITAL CAMERAFigure : Micrometer mechanism detached from index arm.https://sextantbook.com/wp-content/uploads/2015/06/micrometer-exploded.jpgMicrometer explodedFigure : Micrometer mechanism exploded.https://sextantbook.com/wp-content/uploads/2015/06/perpendicularity.jpgPerpendicularityFigure 7: Adjusting index mirror for perpendicularity.https://sextantbook.com/wp-content/uploads/2015/06/rocking-base.jpgRocking baseFigure 6: Mirror bracket adjustment.https://sextantbook.com/wp-content/uploads/2015/06/index-arm-bearing.jpgIndex arm bearingFigure 3: Index arm bearing.https://sextantbook.com/wp-content/uploads/2015/06/back-revealed.jpgBack revealedFigure 3: Rear view without back plate.https://sextantbook.com/wp-content/uploads/2015/06/back.jpgBackFigure 2: Back view.https://sextantbook.com/wp-content/uploads/2015/06/copy-of-ga-front.jpgCopy of GA frontFigure 1: General view of front.2015-06-19T05:51:28+00:00monthlyhttps://sextantbook.com/2012/06/26/c-plath-bubble-horizon-attachment/https://sextantbook.com/wp-content/uploads/2012/06/bottom-of-swing.jpgbottom of swingPostscript 2: End of swing.https://sextantbook.com/wp-content/uploads/2012/06/begin-of-swing.jpgbegin. of swingPostscipt 1: Beginning of swing. Note position of unit in the hand.https://sextantbook.com/wp-content/uploads/2012/06/sold-bubble-unit-ga2.jpgSOLD bubble unit GAhttps://sextantbook.com/wp-content/uploads/2012/06/sold-bubble-unit-ga1.jpgSOLD bubble unit GAFigure 1 c : Drawing of bubble unit (modified from SOLD manual).https://sextantbook.com/wp-content/uploads/2012/06/sold-bubble-unit-ga.jpgSOLD bubble unit GAFigure 1b : Drawing of bubble unit (modified fro SOLD manual)https://sextantbook.com/wp-content/uploads/2012/06/bubble-units-2.jpgBubble units 2Figure 1a : View of bubble chambers from above.https://sextantbook.com/wp-content/uploads/2012/06/bubble-units.jpgBubble unitsFigure 1 : General view of bubble unitshttps://sextantbook.com/wp-content/uploads/2012/06/illumination.jpgIlluminationFigure 2 : Bubble illumination.https://sextantbook.com/wp-content/uploads/2012/06/ray-paths.jpgRay pathsFigure 1 : Ray path through attachment.2015-05-15T07:45:29+00:00monthlyhttps://sextantbook.com/2015/02/26/restoring-an-observator-classic-sextant/https://sextantbook.com/wp-content/uploads/2015/02/observator-0101.jpgObservator 010https://sextantbook.com/wp-content/uploads/2015/02/observator-019.jpgObservator 019Figure 7: Restoration complete.https://sextantbook.com/wp-content/uploads/2015/02/observator-020.jpgOLYMPUS DIGITAL CAMERAhttps://sextantbook.com/wp-content/uploads/2015/02/observator-010.jpgOLYMPUS DIGITAL CAMERAFigure 6: Finished instrument.https://sextantbook.com/wp-content/uploads/2015/02/observator-017.jpgObservator 017Figure 5: Telescope mounting.https://sextantbook.com/wp-content/uploads/2015/02/copy-of-observator-012.jpgCopy of Observator 012Figure 4: Detail of micrometer mechanism.https://sextantbook.com/wp-content/uploads/2015/02/copy-of-observator-006.jpgCopy of Observator 006Figure 3: Micrometer exploded.https://sextantbook.com/wp-content/uploads/2015/02/observator-005.jpgOLYMPUS DIGITAL CAMERAFigure 2: Rack and battery compartment.https://sextantbook.com/wp-content/uploads/2015/02/observator-002.jpgOLYMPUS DIGITAL CAMERAFigure 1: Sextant as received.2015-03-20T18:53:19+00:00monthlyhttps://sextantbook.com/2014/10/16/c-plath-sun-compass-2/https://sextantbook.com/wp-content/uploads/2014/10/2-back-plate-and-mainspring.jpg2) Back plate and mainspringFigure 7: Winding gear detail.https://sextantbook.com/wp-content/uploads/2014/10/seeting-winding.jpgSeeting-windingFigure 6: Winding and setting knobs.https://sextantbook.com/wp-content/uploads/2014/10/alidade-2.jpgAlidade 2Figure 5bhttps://sextantbook.com/wp-content/uploads/2014/10/aliidade.jpgAliidadeFigure 5a: Structure of the alidade.https://sextantbook.com/wp-content/uploads/2014/10/longitude-scale.jpgLongitude scaleFigure 4: Equatorial mounting ring and longitude scale.https://sextantbook.com/wp-content/uploads/2014/10/ga-labelled.jpgGA labelledFigure 3: General arrangement.https://sextantbook.com/wp-content/uploads/2014/10/eq-of-time.jpgEq of timeFigure 2: The equation of time.https://sextantbook.com/wp-content/uploads/2014/10/ga-cropped.jpgGA croppedFigure 1: Dan LaPorte's sun compass.2014-12-23T22:54:50+00:00monthlyhttps://sextantbook.com/2012/11/04/fleuriais-marine-distance-meter/https://sextantbook.com/wp-content/uploads/2012/11/micrometref6.jpgmicrometref6Figure 5: Guyou's circular slide rule.https://sextantbook.com/wp-content/uploads/2012/11/ga-rear.jpgGA rearFigure 4: Rear (right hand side) of instrument.https://sextantbook.com/wp-content/uploads/2012/11/slot1.jpgSlotFigure 3: Side error adjustment.https://sextantbook.com/wp-content/uploads/2012/11/slot.jpgSlothttps://sextantbook.com/wp-content/uploads/2012/11/adjustment-details.jpgAdjustment detailsFigure 2: Details of adjustmentshttps://sextantbook.com/wp-content/uploads/2012/11/ga-front1.jpgFront (left) view)View of front (left-hand-side).https://sextantbook.com/wp-content/uploads/2012/11/ga-front.jpgGA front2014-12-23T22:52:31+00:00monthlyhttps://sextantbook.com/2012/07/13/a-stuart-distance-meter/https://sextantbook.com/wp-content/uploads/2012/07/copy-of-fiske-distance-meter-003.jpgCopy of Fiske distance meter 003Figure 5: Fiske-type stadimeter or distance meter (Mark II, Mod 0).https://sextantbook.com/wp-content/uploads/2012/07/stuart-distance-meter-006.jpgStuart distance meter 006Figure 5: New scale for old.https://sextantbook.com/wp-content/uploads/2012/07/stuart-distance-meter-0031.jpgStuart distance meter 003Figure 3 : To show split image.https://sextantbook.com/wp-content/uploads/2012/07/stuart-distance-meter-003.jpgStuart distance meter 003https://sextantbook.com/wp-content/uploads/2012/07/stuart-distance-meter-002.jpgStuart distance meter 002Figure 2 : Front of distance meterhttps://sextantbook.com/wp-content/uploads/2012/07/stuart-distance-meter-0011.jpgStuart distance meter 001Figure 1 : General view of distance meter.https://sextantbook.com/wp-content/uploads/2012/07/stuart-distance-meter-001.jpgStuart distance meter 001Figure 1 : General view of distance meter.2014-12-23T22:49:43+00:00monthlyhttps://sextantbook.com/2012/06/24/a-russian-naval-dip-meter/https://sextantbook.com/wp-content/uploads/2012/06/ga-english.jpgGA EnglishFigure 6 : General arrangement drawing.https://sextantbook.com/wp-content/uploads/2012/06/telescope.jpgTelescopeFigure 5 : The telescope.https://sextantbook.com/wp-content/uploads/2012/06/plan-view-partial.jpgPlan view partialFigure 4 : 3/4 Plan view.https://sextantbook.com/wp-content/uploads/2012/06/cam1.jpgCamFigure 3 : Adjusting cam.https://sextantbook.com/wp-content/uploads/2012/06/cam.jpgCamhttps://sextantbook.com/wp-content/uploads/2012/06/light-path1.jpgLight pathFigure 2 : Practical light pathhttps://sextantbook.com/wp-content/uploads/2012/06/light-path.jpgLight pathhttps://sextantbook.com/wp-content/uploads/2012/06/russ-dip-meter-f2-copy.jpgRuss dip meter F2 copyFigure 1 : Light path of Russian N5 dip meter.2016-03-06T21:04:15+00:00monthlyhttps://sextantbook.com/2014/12/18/restoration-of-an-early-c19-ebony-quadrant/https://sextantbook.com/wp-content/uploads/2014/12/19-final-view.jpg19 final viewFigure 21: Restoration complete.https://sextantbook.com/wp-content/uploads/2014/12/18-telescope.jpg18 telescopeFigure 19: Telescope in place.https://sextantbook.com/wp-content/uploads/2014/12/18-pinule-2.jpg18 pinule 2https://sextantbook.com/wp-content/uploads/2014/12/17-pinule-1.jpg17 pinule 1Figure 18: Pinhole.https://sextantbook.com/wp-content/uploads/2014/12/16-index-mirror.jpg16 index mirrorFigure 18 Index mirror adjustment.https://sextantbook.com/wp-content/uploads/2014/12/15-graduate-3.jpg15 graduate 3Figure 17: Completed vernier scalehttps://sextantbook.com/wp-content/uploads/2014/12/14-graduate-2.jpg14 graduate 2Figure16: Radial lines scribed.https://sextantbook.com/wp-content/uploads/2014/12/13-graduate-1.jpg13 graduate 1Figure 14: Scriber.https://sextantbook.com/wp-content/uploads/2014/12/label-001.jpgLabel 001Figure 4 : Label of probable maker.https://sextantbook.com/wp-content/uploads/2014/12/12-case-final.jpg12 case finalFigure 14: Finished exterior of case.2014-12-19T09:41:57+00:00monthlyhttps://sextantbook.com/2012/12/26/1972/https://sextantbook.com/wp-content/uploads/2012/12/spanish-sextant-31.jpgSpanish sextant 3Figure 2: English captions.https://sextantbook.com/wp-content/uploads/2012/12/spanish-sextant-2.jpgSpanish sextant 2Figure 3: Close up view of lower end of index arm.https://sextantbook.com/wp-content/uploads/2012/12/spanish-sextant1.jpgSpanish sextantFigure 1: Guardiamarina Vernier Sextanthttps://sextantbook.com/wp-content/uploads/2012/12/spanish-sextant.jpgSpanish sextantFigure 1: Guardiamarina Vernier Sextant2014-10-17T00:55:23+00:00monthlyhttps://sextantbook.com/2013/10/06/incorrect-assembly-of-sno-t-shades/https://sextantbook.com/wp-content/uploads/2013/10/shades-blunder-9.jpgShades blunder 9Figure 1: Shades as fitted.https://sextantbook.com/wp-content/uploads/2013/10/shades-blunder-008.jpgShades blunder 008Figure 2: Remove 2 screws.https://sextantbook.com/wp-content/uploads/2013/10/shades-blunder-007.jpgShades blunder 007Figure 9: Shades now correctly mounted.https://sextantbook.com/wp-content/uploads/2013/10/shades-blunder-006.jpgShades blunder 006Figure 8: New taper pin in place.https://sextantbook.com/wp-content/uploads/2013/10/shades-blunder-005.jpgShades blunder 005Figure 7: Shades and mounting pin in placehttps://sextantbook.com/wp-content/uploads/2013/10/shades-blunder-004.jpgShades blunder 004Figure 6: Placing shades between uprights.https://sextantbook.com/wp-content/uploads/2013/10/shades-blunder-003.jpgShades blunder 003Figure 5: Shades assembly exploded.https://sextantbook.com/wp-content/uploads/2013/10/shades-blunder-002.jpgShades blunder 002Figure 4: Push out mounting pin with drift.https://sextantbook.com/wp-content/uploads/2013/10/shades-blunder-001.jpgShades blunder 001Figure 3: Drift out taper pin.2014-10-09T18:36:30+00:00monthlyhttps://sextantbook.com/2008/10/26/my-new-sno-m/https://sextantbook.com/wp-content/uploads/2008/11/100_20961.jpg100_20961https://sextantbook.com/wp-content/uploads/2008/11/ga-in-case.jpgga-in-casehttps://sextantbook.com/wp-content/uploads/2008/11/100_2098.jpg100_2098https://sextantbook.com/wp-content/uploads/2008/11/100_2096.jpg100_2096https://sextantbook.com/wp-content/uploads/2008/11/100_2094.jpg100_20942014-10-07T19:28:43+00:00monthlyhttps://sextantbook.com/2012/12/05/c-plath-battery-handle-structure/https://sextantbook.com/wp-content/uploads/2012/12/plath-switch.jpgPlath switchhttps://sextantbook.com/wp-content/uploads/2012/12/switch-003.jpgSwitch 003https://sextantbook.com/wp-content/uploads/2012/12/switch-002.jpgSwitch 002https://sextantbook.com/wp-content/uploads/2012/12/switch-001.jpgSwitch 0012018-04-25T22:10:40+00:00monthlyhttps://sextantbook.com/2009/04/26/sounding-sextants-1/https://sextantbook.com/wp-content/uploads/2009/04/station-pointer.jpgstation-pointerhttps://sextantbook.com/wp-content/uploads/2009/04/stanley-survey.jpgstanley-surveyhttps://sextantbook.com/wp-content/uploads/2009/04/100_25291.jpg100_25291https://sextantbook.com/wp-content/uploads/2009/04/100_2529.jpg100_25292014-07-16T04:04:38+00:00monthlyhttps://sextantbook.com/2010/09/01/jesse-ramsden-and-his-dividing-engine/https://sextantbook.com/wp-content/uploads/2010/09/ramsden-portrait.jpgRamsden portraitJesse Ramsden, mathematical instrument maker2015-01-14T19:59:35+00:00monthlyhttps://sextantbook.com/2014/01/23/spencer-browning-and-cos-finest-sextant/https://sextantbook.com/wp-content/uploads/2014/01/spencerand-browning-restored-005.jpgSpencerand Browning restored 005Figure 1: Restored sextant and case.https://sextantbook.com/wp-content/uploads/2014/01/restoration-0011.jpgRestoration 001Figure 11: Unrestored case.https://sextantbook.com/wp-content/uploads/2014/01/index-arm-corrected-002.jpgIndex arm corrected 002Figure 10: Bent index arm corrected.https://sextantbook.com/wp-content/uploads/2014/01/magnifier-001.jpgMagnifier 001Figure 8: Scale magnifier.https://sextantbook.com/wp-content/uploads/2014/01/horizon-mirror-001.jpgHorizon mirror 001Figure 7: Index mirror and shades.https://sextantbook.com/wp-content/uploads/2014/01/spencerand-browning-restored-004.jpgOLYMPUS DIGITAL CAMERAFigure 12: Interior of case with telescopes.https://sextantbook.com/wp-content/uploads/2014/01/copy-of-spencerand-browning-restored-006.jpgCopy of Spencerand Browning restored 006https://sextantbook.com/wp-content/uploads/2014/01/restoration-013.jpgRestoration 013Figure 6: Index mirror clip.https://sextantbook.com/wp-content/uploads/2014/01/restoration-012.jpgRestoration 012Figure 5: Index mirror bracket. https://sextantbook.com/wp-content/uploads/2014/01/restoration-011.jpgRestoration 011Figure 9: Bent index arm.2014-05-22T17:04:48+00:00monthlyhttps://sextantbook.com/2011/03/27/making-circular-sextant-mirrors/https://sextantbook.com/wp-content/uploads/2011/03/circular-mirror-blank.jpgCircular mirror blankFigure 3 : Before and after.https://sextantbook.com/wp-content/uploads/2011/03/copy-of-circular-mirrors-002.jpgCopy of Circular mirrors 002Figure 2 : Grinding set up.https://sextantbook.com/wp-content/uploads/2011/03/copy-of-circular-mirrors-tool.jpgCopy of Circular mirrors toolFigure 1 : Grinding tool2013-10-25T02:34:53+00:00monthlyhttps://sextantbook.com/2011/09/02/tamaya-collimation-blunder/https://sextantbook.com/wp-content/uploads/2011/09/risng-pieces3.jpgRisng pieces3Figure 2 : top - faulty collimation; below - corrected collimation.https://sextantbook.com/wp-content/uploads/2011/09/rising-piece4.jpgrising-piece4Figure 1 : Collimating rising piece exploded2014-05-03T02:52:24+00:00monthlyhttps://sextantbook.com/2013/10/05/making-a-shades-adjusting-tool/https://sextantbook.com/wp-content/uploads/2013/10/tool-make-012.jpgTool make 012Figure 10: The tool in use.https://sextantbook.com/wp-content/uploads/2013/10/tool-make-011.jpgTool make 011Figure 8: The completed tool.https://sextantbook.com/wp-content/uploads/2013/10/tool-make-001.jpgTool make 001Figure 2: Turn spigot to fit nut.https://sextantbook.com/wp-content/uploads/2013/10/tool-make-006.jpgTool make 006Figure 7: Parting off.https://sextantbook.com/wp-content/uploads/2013/10/tool-make-005.jpgTool make 005Figure 6: Knurling.https://sextantbook.com/wp-content/uploads/2013/10/tool-make-004.jpgTool make 004Figure 5: Cross drilled for tommy bar.https://sextantbook.com/wp-content/uploads/2013/10/tool-make-003.jpgTool make 003Figure 4: Clearance hole drilled.https://sextantbook.com/wp-content/uploads/2013/10/tool-make-002.jpgTool make 002Figure 3: Nut used as jig to drill holes.https://sextantbook.com/wp-content/uploads/2013/10/tool-drawing-2-jpg.jpgTool drawing.2 JPGFigure 1: Drawing of tool.https://sextantbook.com/wp-content/uploads/2013/10/tool-drawing.jpgTool drawingFigure 1: Drawing of tool.2013-10-05T23:06:21+00:00monthlyhttps://sextantbook.com/2013/03/29/later-tamaya-scale-lighting-systems/https://sextantbook.com/wp-content/uploads/2013/03/6-spica-bulb1.jpeg6 Spica bulbFigure 6 : Position of bulb in Spica sextant.https://sextantbook.com/wp-content/uploads/2013/03/3-wire.jpg3 Wirehttps://sextantbook.com/wp-content/uploads/2013/03/6-spica-bulb.jpeg6 Spica bulbhttps://sextantbook.com/wp-content/uploads/2013/03/5-bulb-contacts.jpg5 Bulb contactsFigure 5 : How wire contacts bulb.https://sextantbook.com/wp-content/uploads/2013/03/4-bulb.jpg4 BulbFigure 5 : Bulb in Jupiter and simllar sextants.https://sextantbook.com/wp-content/uploads/2013/03/2-assembled.jpg2 AssembledFigure 2 : Switch parts assembled outside handle.https://sextantbook.com/wp-content/uploads/2013/03/1-exploded.jpg1 explodedFigure 1 : Structure of switch exploded.2013-09-30T02:55:46+00:00monthlyhttps://sextantbook.com/2013/09/04/adapting-to-leds-2-c-plath-bubble-horizon-unit/https://sextantbook.com/wp-content/uploads/2013/09/bubble-unit-conversion-009.jpgBubble unit conversion 009Figure 7: Finished adapter.https://sextantbook.com/wp-content/uploads/2013/09/resistor-adapter.jpgResistor adapterFigure 5: Resistor adapter.https://sextantbook.com/wp-content/uploads/2013/09/copy-of-bubble-unit-conversion-007.jpgCopy of Bubble unit conversion 007Figure 4: Star sight adapter.https://sextantbook.com/wp-content/uploads/2013/09/bubble-unit-conversion-006.jpgOLYMPUS DIGITAL CAMERAhttps://sextantbook.com/wp-content/uploads/2013/09/bubble-unit-conversion-005.jpgOLYMPUS DIGITAL CAMERAFigure 3: Replacement rheostat in place.https://sextantbook.com/wp-content/uploads/2013/09/bubble-unit-conversion-004.jpgOLYMPUS DIGITAL CAMERAFigure 2: Wires to rheostat unsoldered.https://sextantbook.com/wp-content/uploads/2013/09/copy-of-bubble-unit-conversion-001.jpgCopy of Bubble unit conversion 001Figure 1: Remove cover.2013-09-04T08:57:27+00:00monthlyhttps://sextantbook.com/2013/09/04/adapting-to-leds-1-miniature-screw-bases/https://sextantbook.com/wp-content/uploads/2013/09/bulb-adapt-010.jpgBulb adapt 010Figure 7: LED adaptation alongside original globe.https://sextantbook.com/wp-content/uploads/2013/09/bulb-adapt-009.jpgBulb adapt 009https://sextantbook.com/wp-content/uploads/2013/09/bulb-adapt-008.jpgBulb adapt 008Figure 6: Leads soldered.https://sextantbook.com/wp-content/uploads/2013/09/bulb-adapt-007.jpgOLYMPUS DIGITAL CAMERAhttps://sextantbook.com/wp-content/uploads/2013/09/bulb-adapt-006.jpgBulb adapt 006https://sextantbook.com/wp-content/uploads/2013/09/bulb-adapt-005.jpgBulb adapt 005Figure 4: Cutting notch for positive wire.https://sextantbook.com/wp-content/uploads/2013/09/bulb-adapt-004.jpgBulb adapt 004Figure 3: Salvaged base.https://sextantbook.com/wp-content/uploads/2013/09/bulb-adapt-003.jpgBulb adapt 003Figure 2: Removing remnants of wires.https://sextantbook.com/wp-content/uploads/2013/09/bulb-adapt-001.jpgBulb adapt 001Figure 1: Removing old globe.2019-04-17T04:25:35+00:00monthlyhttps://sextantbook.com/2010/07/14/faking-it-is-it-a-sno-m-or-is-it-a-c-plath/https://sextantbook.com/wp-content/uploads/2010/07/die-woch.jpgDie Wochhttps://sextantbook.com/wp-content/uploads/2010/07/shades-compare.jpgShades compareFig 5https://sextantbook.com/wp-content/uploads/2010/07/logos-compared.jpgLogos comparedFig 10https://sextantbook.com/wp-content/uploads/2010/07/index-arms-compared1.jpgIndex arms comparedhttps://sextantbook.com/wp-content/uploads/2010/07/scope.jpgScopeFig 9https://sextantbook.com/wp-content/uploads/2010/07/plath-snom-020.jpgPlath SNOM 020Fig 8https://sextantbook.com/wp-content/uploads/2010/07/edge-radii.jpgEdge radiiFig 7https://sextantbook.com/wp-content/uploads/2010/07/index-arm-1.jpgIndex arm 1Fig 6https://sextantbook.com/wp-content/uploads/2010/07/index-arms-compared.jpgIndex arms comparedFig 5https://sextantbook.com/wp-content/uploads/2010/07/h-bracket-shapes.jpgH bracket shapesFig 42019-01-09T21:45:54+00:00monthlyhttps://sextantbook.com/2013/02/01/shackman-sextant-and-a-link-to-jesse-ramsden/https://sextantbook.com/wp-content/uploads/2013/02/12-shade-lock-2-jpg.jpg12 Shade lock.2 jpgFigure 14: Shades assemblyhttps://sextantbook.com/wp-content/uploads/2013/02/13-case-after.jpg13 Case afterFigure 14: Re-finished case.https://sextantbook.com/wp-content/uploads/2013/02/14-latch.jpg14 LatchFigure 16: Safety latch.https://sextantbook.com/wp-content/uploads/2013/02/12-shade-lock.jpg12 Shade lockFigure 14: Shades assembly.https://sextantbook.com/wp-content/uploads/2013/02/6-index-nut.jpg6 index nutFigure 14: Index arm bearing.https://sextantbook.com/wp-content/uploads/2013/02/11-micro-exploded1.jpg11 Micro explodedFigure 12: Micrometer mechanism fully explodedhttps://sextantbook.com/wp-content/uploads/2013/02/11-micro-exploded.jpg11 Micro explodedFigure 12: Micrometer mechanism exploded.https://sextantbook.com/wp-content/uploads/2013/02/10-micro-exploded.jpg10 Micro explodedFigure 11: Micrometer mechanism partly exploded.https://sextantbook.com/wp-content/uploads/2013/02/8-micro-003.jpg8 Micro 003Figure 10: General view of micrometer mechanismhttps://sextantbook.com/wp-content/uploads/2013/02/9-micro-keeper.jpg9 Micro, keeperFigure 9: Underside of lower index arm2013-09-06T18:39:04+00:00monthlyhttps://sextantbook.com/2009/01/27/how-flat-are-sextant-mirrors/https://sextantbook.com/wp-content/uploads/2009/01/100_23014.jpg100_23014Horizon Mirror 1916 Brandis and Cohttps://sextantbook.com/wp-content/uploads/2009/01/100_23013.jpg100_23013Horizon mirror 1916 Barndis and Cohttps://sextantbook.com/wp-content/uploads/2009/01/float-glass.jpgfloat-glassModern commercial 3 mm float glasshttps://sextantbook.com/wp-content/uploads/2009/01/100_2303.jpg100_2303Horizon mirror 1920's Heath Sounding sextanthttps://sextantbook.com/wp-content/uploads/2009/01/100_2302.jpg100_2302Index Mirror, 1938 Hughes and Cohttps://sextantbook.com/wp-content/uploads/2009/01/100_23012.jpg100_23012Horizon mirror C19 Crichtonhttps://sextantbook.com/wp-content/uploads/2009/01/100_23011.jpg100_23011https://sextantbook.com/wp-content/uploads/2009/01/100_2301.jpg100_2301https://sextantbook.com/wp-content/uploads/2009/01/100_2300.jpg100_2300Index Mirror. C19 Crichton.2012-12-07T18:47:41+00:00monthlyhttps://sextantbook.com/2009/01/03/evolution-of-the-sextant-micrometer/https://sextantbook.com/wp-content/uploads/2009/01/rapid-release-clamp-detail.jpgRapid release clamp detailFigure 6 : Heath and Co's rapid release clamp mechanismhttps://sextantbook.com/wp-content/uploads/2009/01/copy-of-copy-of-micrometer-precursor-7.jpgCopy of Copy of Micrometer precursor 7Figure 5 : Detail of Plath rapid release mechanism. Copyright Brent Evers, with permissionhttps://sextantbook.com/wp-content/uploads/2009/01/micrometer-precursor-4.jpgMicrometer precursor 4Figure 5 : C Plath Dreikreis sextant with rapid release clamp. Copyright Brenth Evers, with permission.https://sextantbook.com/wp-content/uploads/2009/01/heath-patdnt-excerpt.jpgHeath patdnt excerpthttps://sextantbook.com/wp-content/uploads/2009/01/micrometer-detail1.jpgmicrometer-detail1Hughes micrometer, final versionhttps://sextantbook.com/wp-content/uploads/2009/01/exploded-micrometer1.jpgexploded-micrometer1Micrometer, exploded viewhttps://sextantbook.com/wp-content/uploads/2009/01/exploded-micrometer.jpgexploded-micrometerhttps://sextantbook.com/wp-content/uploads/2009/01/micrometer-rear.jpgmicrometer-rearMicrometer, rear viewhttps://sextantbook.com/wp-content/uploads/2009/01/micrometer-front.jpgmicrometer-frontMicrometer, front viewhttps://sextantbook.com/wp-content/uploads/2009/01/copy-of-heath-micro3.jpgcopy-of-heath-micro32014-02-23T04:29:44+00:00monthlyhttps://sextantbook.com/2010/07/18/polarising-sextant-shades/https://sextantbook.com/wp-content/uploads/2010/07/polar-3.jpgPolar 3Figure 3https://sextantbook.com/wp-content/uploads/2010/07/polar-2.jpgPolar 2Figure 2https://sextantbook.com/wp-content/uploads/2010/07/polar-1.jpgPolar 1Figure 1 2012-12-05T18:56:06+00:00monthlyhttps://sextantbook.com/2010/09/28/evolution-of-the-sextant-frame/https://sextantbook.com/wp-content/uploads/2010/09/frame-construction-0112.jpgFrame construction 011Figure 22 : Rear of finished MK III framehttps://sextantbook.com/wp-content/uploads/2010/09/100_35811.jpg100_3581Figure 5 : Davis Mk 15 plastic sextanthttps://sextantbook.com/wp-content/uploads/2010/09/wooden-frame-rear1.jpgWooden frame rearFigure 5 : Joints of C19 ebony octanthttps://sextantbook.com/wp-content/uploads/2010/09/new-scope.jpgNew scopeFigure 25 : Freiberger Skalensextanthttps://sextantbook.com/wp-content/uploads/2010/09/100_2608.jpg100_2608https://sextantbook.com/wp-content/uploads/2010/09/freiberger-ga.jpgFreiberger GAFigure 24 : Freiberger Trommelsextanthttps://sextantbook.com/wp-content/uploads/2010/09/plath-ww-ii-001.jpgPlath WW II 001Figure 23 : Wartime C Plath sextant, triangulated framehttps://sextantbook.com/wp-content/uploads/2010/09/frame-construction-0111.jpgFrame construction 011Figure 22 : Rear of finished framehttps://sextantbook.com/wp-content/uploads/2010/09/frame-construction-006.jpgFrame construction 006https://sextantbook.com/wp-content/uploads/2010/09/frame-construction-011.jpgFrame construction 011Figure 21 : Rack and frame united2012-11-15T19:26:18+00:00monthlyhttps://sextantbook.com/2011/09/21/an-hungarian-sextant-via-bulgaria/https://sextantbook.com/wp-content/uploads/2011/09/gamma-0072.jpgGamma 007Figure 9 : Completed restoration.https://sextantbook.com/wp-content/uploads/2011/09/copy-of-worms.jpgCopy of WormsFigure 7 : Two worms and their shafts.https://sextantbook.com/wp-content/uploads/2011/09/gamma-0071.jpgGamma 007Figure 8 : Completed restorationhttps://sextantbook.com/wp-content/uploads/2011/09/gamma-007.jpgOLYMPUS DIGITAL CAMERAFigure 8 : Completed restorationhttps://sextantbook.com/wp-content/uploads/2011/09/gamma-errors2.jpgGamma errorshttps://sextantbook.com/wp-content/uploads/2011/09/adj-screws2.jpgAdj screwsFigure 6 : Mirror adjusting acrews.https://sextantbook.com/wp-content/uploads/2011/09/adj-screws1.jpgAdj screwsMirror adjusting screw.https://sextantbook.com/wp-content/uploads/2011/09/clips2.jpgClipsFigure 5 : Mirror clips.https://sextantbook.com/wp-content/uploads/2011/09/adj-screws.jpgAdj screwshttps://sextantbook.com/wp-content/uploads/2011/09/clips1.jpgClipsFigure 5 : Mirror clips.2012-08-29T20:11:33+00:00monthlyhttps://sextantbook.com/2012/04/05/some-dip-meters/https://sextantbook.com/wp-content/uploads/2012/04/ray-path5.jpgRay pathFigure 1: Dip with and without allowance for refractionhttps://sextantbook.com/wp-content/uploads/2012/04/ray-path4.jpgRay pathhttps://sextantbook.com/wp-content/uploads/2012/04/ray-path3.jpgRay pathshttps://sextantbook.com/wp-content/uploads/2012/04/ray-path2.jpgRay pathshttps://sextantbook.com/wp-content/uploads/2012/04/ray-path1.jpgRay pathshttps://sextantbook.com/wp-content/uploads/2012/04/dip-meter-005.jpgDip meter 005Figure 6 : Mirror adjusting screws.https://sextantbook.com/wp-content/uploads/2012/04/dip1.jpgDipFigure 1 : Illustrating dip.https://sextantbook.com/wp-content/uploads/2012/04/dip.jpgDiphttps://sextantbook.com/wp-content/uploads/2012/04/gabrisheff.jpgGabrisheffhttps://sextantbook.com/wp-content/uploads/2012/04/blish.jpgBlishFigure 1 : Blish prism attached to nautical sextant.2012-06-23T03:58:01+00:00monthlyhttps://sextantbook.com/2012/06/16/simex-sextants/https://sextantbook.com/wp-content/uploads/2012/06/copy-of-simonsen-001.jpgCopy of Simonsen 001Figure 6 : Horizon shade and bracket, exploded view.https://sextantbook.com/wp-content/uploads/2012/06/simonsen-002.jpgSimonsen 002Figure 5 : Horizon shade and bracket.https://sextantbook.com/wp-content/uploads/2012/06/simonsen-010.jpgSimonsen 010Figure 4 : Astigmatiser and polarising shade.https://sextantbook.com/wp-content/uploads/2012/06/simonsen-005.jpgSimonsen 005Figure 3 : Detail of micrometer and illumination.https://sextantbook.com/wp-content/uploads/2012/06/simonsen-004.jpgSimonsen 004Figure 2 : Rear (RHS) of Simex Mariner sextant.https://sextantbook.com/wp-content/uploads/2012/06/simonsen-003.jpgSimonsen 003Figure 1 : Front (LHS) of Simex Mariner sextant2012-06-16T07:16:35+00:00monthlyhttps://sextantbook.com/2011/12/10/heath-and-companys-best-vernier-sextant/https://sextantbook.com/wp-content/uploads/2011/12/release-catch-composite.jpgRelease catch compositeFigure 13 : Release catchhttps://sextantbook.com/wp-content/uploads/2011/12/magnifier.jpgMagnifierFigure 12 : Magnifier mounting.https://sextantbook.com/wp-content/uploads/2011/12/u486-004.jpgU486 004Figure 10 : Front view of horizon mirror.https://sextantbook.com/wp-content/uploads/2011/12/horizon-mirror1.jpgHorizon mirrorFigure 9 : Horizon mirror.https://sextantbook.com/wp-content/uploads/2011/12/optics-3.jpgOptics 3Figure 6 : Telescope kit.https://sextantbook.com/wp-content/uploads/2011/12/certificate-blanked.jpgCertificate blankedFigure 1 : Inspection certificate.https://sextantbook.com/wp-content/uploads/2011/12/optics-21.jpgOptics 2https://sextantbook.com/wp-content/uploads/2011/12/optics-11.jpgOptics 1https://sextantbook.com/wp-content/uploads/2011/12/index-arm-bearing1.jpgIndex arm bearingFigure 8 : Index arm bearing.https://sextantbook.com/wp-content/uploads/2011/12/index-shades1.jpgIndex shades2012-04-04T21:40:54+00:00monthlyhttps://sextantbook.com/2012/03/11/an-early-c19-ebony-quadrant-restored/https://sextantbook.com/wp-content/uploads/2012/03/1a2.jpg1aFigure 1 : Name plate.https://sextantbook.com/wp-content/uploads/2012/03/28-ga-rear.jpg28 ga rearFigure 28 : Rear (right hand) view.https://sextantbook.com/wp-content/uploads/2012/03/27-ga-front.jpg27 ga frontFigure 29 : Front (left-hand) view.https://sextantbook.com/wp-content/uploads/2012/03/24-assembly-7.jpgOLYMPUS DIGITAL CAMERAFigure 26 : Fitting of index arm bearing.https://sextantbook.com/wp-content/uploads/2012/03/23-assembly-6.jpg23 assembly 6Figure 25 : Index arm bearing and journal.https://sextantbook.com/wp-content/uploads/2012/03/17-shades-6.jpg17 shades 6Figure 24 : Shades aseembled in mounting.https://sextantbook.com/wp-content/uploads/2012/03/16-shades-5.jpg16 shades 5Figure 22 : Base for pillar and cheeks.https://sextantbook.com/wp-content/uploads/2012/03/15-shades-4.jpg15 shades 4Figure 22 : Shade mounts ready to receive glass.https://sextantbook.com/wp-content/uploads/2012/03/15-shades-3.jpg15 shades 3Figure 22 : Mounts ready for drilling and boring.https://sextantbook.com/wp-content/uploads/2012/03/14-shades-2.jpg14 shades 2Figure 20 : Fine filing close to completion.2016-02-26T19:42:28+00:00monthlyhttps://sextantbook.com/2010/02/18/a-drowned-husun-three-circle-sextant/https://sextantbook.com/wp-content/uploads/2010/02/micrometer.jpgMicrometerhttps://sextantbook.com/wp-content/uploads/2010/02/100_3464.jpg100_3464https://sextantbook.com/wp-content/uploads/2010/02/ga1.jpgGA1https://sextantbook.com/wp-content/uploads/2010/02/lamp-arm.jpgLamp armhttps://sextantbook.com/wp-content/uploads/2010/02/lamp-screw.jpgLamp screwhttps://sextantbook.com/wp-content/uploads/2010/02/lamp-bore.jpgLamp borehttps://sextantbook.com/wp-content/uploads/2010/02/lamp-turn1.jpgLamp turn1https://sextantbook.com/wp-content/uploads/2010/02/100_34351.jpg100_3435https://sextantbook.com/wp-content/uploads/2010/02/lamp-mount-exploded.jpgLamp mount. explodedhttps://sextantbook.com/wp-content/uploads/2010/02/batt-latch.jpgBatt latch2013-03-26T01:10:46+00:00monthlyhttps://sextantbook.com/2010/10/05/a-fine-sextant-by-filotecnica-salmoirhagi-of-milan/https://sextantbook.com/wp-content/uploads/2010/10/la-filotecnica-sextant-017.jpgLa Filotecnica sextant 017Figure 13 : Battery handlehttps://sextantbook.com/wp-content/uploads/2010/10/la-filotecnica-micrometer-2-011.jpgLa Filotecnica micrometer 2 011Figure 7 : Swing arm https://sextantbook.com/wp-content/uploads/2010/10/la-filotecnica-sextant-024.jpgOLYMPUS DIGITAL CAMERAFigure 12 : Monocular and its rising piece.https://sextantbook.com/wp-content/uploads/2010/10/exploded-scope-mount.jpgExploded scope mountFigure 10 : Exploded telescope mountinghttps://sextantbook.com/wp-content/uploads/2010/10/la-filotecnica-sextant-020.jpgLa Filotecnica sextant 020Figure 9 : Telescope attachment 1https://sextantbook.com/wp-content/uploads/2010/10/la-filotecnica-sextant-0142.jpgOLYMPUS DIGITAL CAMERAFigure 7 : Micrometer worm shaft bearings.https://sextantbook.com/wp-content/uploads/2010/10/la-filotecnica-sextant-0141.jpgOLYMPUS DIGITAL CAMERAFigure 7 : Micrometer shaft bearingshttps://sextantbook.com/wp-content/uploads/2010/10/la-filotecnica-sextant-0031.jpgLa Filotecnica sextant 003Figure 8 : Chart of non-adjustable errorshttps://sextantbook.com/wp-content/uploads/2010/10/la-filotecnica-sextant-003.jpgLa Filotecnica sextant 003Figure 8 : Error chart.https://sextantbook.com/wp-content/uploads/2010/10/la-filotecnica-sextant-014.jpgOLYMPUS DIGITAL CAMERAFigure 7 : Worm shaft bearings2017-06-17T22:54:38+00:00monthlyhttps://sextantbook.com/2011/12/04/a-fine-c-plath-vernier-sextant/https://sextantbook.com/wp-content/uploads/2011/11/magnifier1.jpgMagnifierhttps://sextantbook.com/wp-content/uploads/2011/11/rising-piece-exploded1.jpgRising piece explodedFigure 7 : Rising piece exploded.https://sextantbook.com/wp-content/uploads/2011/11/rack-and-worm1.jpgRack and wormFigure 8 : Rack and worm.https://sextantbook.com/wp-content/uploads/2011/11/release-catch2.jpgOLYMPUS DIGITAL CAMERAFigure 5 : Release catch.https://sextantbook.com/wp-content/uploads/2011/11/release-catch1.jpgOLYMPUS DIGITAL CAMERAhttps://sextantbook.com/wp-content/uploads/2011/11/case-contents1.jpgCase contentsFigure 3 : Contents of case.https://sextantbook.com/wp-content/uploads/2011/11/rising-piece.jpgRising pieceFigure 7 : Rising piece.https://sextantbook.com/wp-content/uploads/2011/11/magnifier.jpgMagnifierFigure 8 : Index arm details.https://sextantbook.com/wp-content/uploads/2011/11/adjusting-screw.jpgAdjusting screwFigure 4 : Mirror adjusting device.https://sextantbook.com/wp-content/uploads/2011/11/sunseekers.jpgSunseekersFigure 2 : Sunseeker logos on lock escutcheon, name plate and limb2011-12-10T23:34:38+00:00monthlyhttps://sextantbook.com/2011/12/09/gummed-up-an-5851-1-bubble-sextant-averager/https://sextantbook.com/wp-content/uploads/2011/12/averager-008.jpgAverager 008Figure 6 : Important areas from which to remove excess oil.https://sextantbook.com/wp-content/uploads/2011/12/averager-007.jpgOLYMPUS DIGITAL CAMERAhttps://sextantbook.com/wp-content/uploads/2011/12/averager-006.jpgOLYMPUS DIGITAL CAMERAhttps://sextantbook.com/wp-content/uploads/2011/12/averager-005.jpgOLYMPUS DIGITAL CAMERAFigure 5 : Remove twelve screws and cover.https://sextantbook.com/wp-content/uploads/2011/12/averager-004.jpgAverager 004Figure 4 : Remove one screw. Note washer.https://sextantbook.com/wp-content/uploads/2011/12/averager-003.jpgAverager 003Figure 3 : Remove one screw.https://sextantbook.com/wp-content/uploads/2011/12/averager-002.jpgAverager 002Figure 2 : Remove two screws.https://sextantbook.com/wp-content/uploads/2011/12/averager-001.jpgAverager 001Figure 1 : Remove two screws and nut and bolt.2011-12-10T07:35:12+00:00monthlyhttps://sextantbook.com/2010/12/14/a-us-maritime-commission-sextant/https://sextantbook.com/wp-content/uploads/2010/12/copy-of-rear-original1.jpgCopy of rear originalFigure 1a : Rear (RHS) of sextant as foundhttps://sextantbook.com/wp-content/uploads/2010/12/copy-of-rear-original.jpgCopy of rear originalFigure 1a : Rear (RHS) of sextant as found.https://sextantbook.com/wp-content/uploads/2010/12/front-after.jpgFront afterFigure 8 : Fully restored instrumenthttps://sextantbook.com/wp-content/uploads/2010/12/box-front.jpgOLYMPUS DIGITAL CAMERAFigure 7 : Front of casehttps://sextantbook.com/wp-content/uploads/2010/12/box-inside1.jpgOLYMPUS DIGITAL CAMERAFigure 6 : Case insidehttps://sextantbook.com/wp-content/uploads/2010/12/box-inside.jpgOLYMPUS DIGITAL CAMERAFigure 6 : Interior of casehttps://sextantbook.com/wp-content/uploads/2010/12/mirros-combined-view.jpgOLYMPUS DIGITAL CAMERAFigure 5 : Index and horizon mirror mounting detailhttps://sextantbook.com/wp-content/uploads/2010/12/copy-of-keeper.jpgCopy of keeperFigure 4 : Keeper detailhttps://sextantbook.com/wp-content/uploads/2010/12/micrometer-mechanism.jpgMicrometer mechanismFigure 3 : Micrometer mechanismhttps://sextantbook.com/wp-content/uploads/2010/12/rear-finished.jpgRear finishedFigure 2 : Rear view of restored sextant2016-04-18T19:16:04+00:00monthlyhttps://sextantbook.com/2010/09/02/a-nautical-sextant-bubble-horizon/https://sextantbook.com/wp-content/uploads/2010/09/book-sale-027.jpgBook sale 027Figure 2 Rear view of unithttps://sextantbook.com/wp-content/uploads/2010/08/lightpath.jpgLightpath2013-07-29T00:36:39+00:00monthlyhttps://sextantbook.com/2011/08/10/freiberger-drum-sextant-trommelsextant/https://sextantbook.com/wp-content/uploads/2011/08/ga-rear.jpgGA rearFigure 2 : Freiberger drum sextant, rear view.https://sextantbook.com/wp-content/uploads/2011/08/ga-front.jpgGA frontFigure 1 : Freiberger drum sextant, front view.2011-08-14T09:36:06+00:00monthlyhttps://sextantbook.com/2011/07/16/which-lubricant/2011-12-09T23:30:02+00:00monthlyhttps://sextantbook.com/2011/06/23/british-admiralty-vernier-sextant/https://sextantbook.com/wp-content/uploads/2011/06/tangent-screw-xpl2.jpgTangent screw xplFigure 13 : Tangent screw mechanism exploded.https://sextantbook.com/wp-content/uploads/2011/06/tangent-screw-xpl1.jpgTangent screw xplFigure 13 : Tangent screw mechanism exploded.https://sextantbook.com/wp-content/uploads/2011/06/in-box.jpgIn boxFigure 14 : Sextant in casehttps://sextantbook.com/wp-content/uploads/2011/06/ga11.jpgGA1Figure 1 : Admiralty Pattern sextant and accesorieshttps://sextantbook.com/wp-content/uploads/2011/06/tangent-screw-xpl.jpgTangent screw xplFigure 13 : Tangent screw mechanism explodedhttps://sextantbook.com/wp-content/uploads/2011/06/tangent-screw-lab.jpgTangent screw labFigure 12 : Tangent screw mechanism in situ.https://sextantbook.com/wp-content/uploads/2011/06/magnifier.jpgMagnifierFigure 10 : Magnifier mountinghttps://sextantbook.com/wp-content/uploads/2011/06/horizon-mirror-glass.jpgHorizon mirror glassFigure 10 : Rear of horizon mirror sandwich.https://sextantbook.com/wp-content/uploads/2011/06/horizon-mirror-expl1.jpgHorizon mirror explFigure 9 : Horizon mirror mounting exploded.https://sextantbook.com/wp-content/uploads/2011/06/horizon-mirror-expl.jpgHorizon mirror expl2016-08-31T23:18:39+00:00monthlyhttps://sextantbook.com/2008/12/18/refilling-mark-v-an5851-bubble-chambers/https://sextantbook.com/wp-content/uploads/2008/12/100_2210.jpg100_22102013-05-20T15:12:50+00:00monthlyhttps://sextantbook.com/2011/03/20/c-plath-sextant-lives-again/https://sextantbook.com/wp-content/uploads/2011/03/completed.jpgCompletedFigure 14 : Sextant no. 3****6 lives againhttps://sextantbook.com/wp-content/uploads/2011/03/c-plath-overhaul-030.jpgC Plath overhaul 030Figure 13 : Uprighted mandrelhttps://sextantbook.com/wp-content/uploads/2011/03/plath-errors-2.jpgPlath errors 2Table 2 : Errors improvedhttps://sextantbook.com/wp-content/uploads/2011/03/bent-frame-2.jpgBent frame 2Figure 13 : Uprighted mandrelhttps://sextantbook.com/wp-content/uploads/2011/03/bent-frame-1.jpgBent frame 1Figure 12 : Leaning mandrel.https://sextantbook.com/wp-content/uploads/2011/03/errors-1.jpgerrors 1Table 1 : Sextant errors, first run.https://sextantbook.com/wp-content/uploads/2011/03/objective.jpgObjectiveFigure 11 : Labyrinth seal of monocular objective.https://sextantbook.com/wp-content/uploads/2011/03/new-drum.jpgNew drumFigure 10 : New drum.https://sextantbook.com/wp-content/uploads/2011/03/number-punching.jpgNumber punchingFigure 9 : Punching numbers.https://sextantbook.com/wp-content/uploads/2011/03/headstock-divider.jpgHeadstock dividerFigure 8 : Headstock dividing.2014-02-25T04:02:58+00:00monthlyhttps://sextantbook.com/2011/02/13/a-sextant-calibrator-2/https://sextantbook.com/wp-content/uploads/2011/02/table-21.jpgTable 2Table 2 : Errors for SNO-T sextanthttps://sextantbook.com/wp-content/uploads/2011/02/calibration-005.jpgCalibration 005Figure 11: Sextant about to be calibratedhttps://sextantbook.com/wp-content/uploads/2011/02/table-13.jpgTable 1Table 1: Calibrator errorshttps://sextantbook.com/wp-content/uploads/2011/02/table-2.jpgTable 2Table 2: Calibration of a SNO-T 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02010-11-23T20:17:16+00:00monthlyhttps://sextantbook.com/2009/03/22/freiberger-skalen-sextant/https://sextantbook.com/wp-content/uploads/2009/03/size-comparison.jpgsize-comparisonhttps://sextantbook.com/wp-content/uploads/2009/03/100_2672.jpg100_2672https://sextantbook.com/wp-content/uploads/2009/03/100_2605.jpg100_2605https://sextantbook.com/wp-content/uploads/2009/03/scale.jpgscalehttps://sextantbook.com/wp-content/uploads/2009/03/after-cleanup2.jpgafter-cleanup2https://sextantbook.com/wp-content/uploads/2009/03/after-cleanup1.jpgafter-cleanup1https://sextantbook.com/wp-content/uploads/2009/03/after-cleanup.jpgafter-cleanuphttps://sextantbook.com/wp-content/uploads/2009/03/skalen-sextant-as-recd.jpgskalen-sextant-as-recdhttps://sextantbook.com/wp-content/uploads/2009/03/ga1.jpgga1https://sextantbook.com/wp-content/uploads/2009/03/ga.jpgga2017-04-07T20:11:03+00:00monthlyhttps://sextantbook.com/2010/04/28/troughton-and-simms-surveying-sextant/https://sextantbook.com/wp-content/uploads/2010/04/index-mirror.jpgIndex 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