INDEX
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adhesives, industrial 27 Mar 11
Admiralty, British, vernier pattern of sextant 27 Mar 11, 24 June 11
Admiralty, British, micrometer version of sextant 15 Feb, 18
alcohol, filling of A10 A bubble chambers 13 Oct 09
angle, vertical sextant 13 Jul 12
Araldite, for cementing lenses 24 Jan 10
refractive index of 24 Jan 10 (Comment)
arc, dangers of polishing 24 Jan 10
ivory 26 July 22
platinum 10 June 10
silver, letting in to limb 10 June 10
silver in brass on wood 26 July 2022
astigmatiser shade 20 Mar 11
autocollimator, principle of 6 July 09, 13 Feb 11
accuracy of 12 Mar 09, 13 Feb 11
calibrating dip meter with 5 Apr 2012
setting wires of 13 Feb11
view through eyepiece of 13 Feb 11
backlash 12 Mar 09
beam splitter 13 Feb11
bearing,
index arm 18 Feb 10, 13 Jul 12
adjusting 12 Mar 09
of US Maritime Commission sextant 15 Dec 10
swing arm
conical centres 12 Mar 09
plain 12 Mar 09
of US Maritime Commission sextant 15 Dec 10
Belleville, Julien 26 July
Belleville washer 18 Feb 10, 11 Aug 09, 26 July 22
Blish prism 5 Apr 2012
Bochard de Saron 26 July 22
Bracket, mirror,
bent 20 Oct 16
slotted 1 Oct 14
shade 14 June15
brass, hammered 10 Nov 09
bubble chamber
overhaul, of AN5851 20 Dec 08
refilling, of AN5851 20 Dec 08
bubble sextant
A Coutinho Pattern 6 May 16
restoration,
A10 series 25 Feb 09, 13 Oct 10
screw closure of 13 Oct 10
Mk IX series 25 Feb 09
British Admiralty pattern sextant 24 June 11
Broken legs, mending 7 Oct 16
Byrd sextant 30 May 09
Byrd, Commander Richard 30 May 09
calibration, of C18 sextant 10 June 10
calibrator, sextant
calibration of 13 Feb11
construction of 13 Feb 11
mounting sextant on 13 Feb 11
Carbonara, Victor 1 Oct 14
Carl Path’s earliest sextant (see also C Plath) 21 April 2017
case
latches 18 Feb 10
keystone 17 Dec 09
furniture, of US Maritime Commission sextant 15 Dec 10
plywood, delamination of 14 June 15
repair of SNO-T 28 November 2020
casting, pressure die- 14 July10
C Plath (See also Carl Plath and Plath)
production numbers 14 July 10 (see also Plath)
sextants, eighty years of 13 Nov 12
yachting sextant 14 June 15
centres, as bearings 12 Mar 09
chassis, swing arm 12 Mar 09
of La Filotecnica sextant 5 Oct 10
CHO-M sextant. See SNO-M sextant
Chronometer, marine See www.chronometerbook.com
cleaning sextant parts 18 Feb 10, 23 Nov 08
clearance, axial of worm 12 Mar 09
collimating rising piece 2 September 11
collimation, faulty 2 September 11, 28 November 2020
collimator 13 Deb 11
horizontal 13 Feb 11
Commission, US Maritime 15 Dec 10
Cooke and Son 28 Apr 10
Coutinho Pattern Bubble sextant 6 May 16
Dip 5 Apr 2012
abnormal 5 Apr 2012
meters 5 Apr 2012, 23 June 2012
calibration of 5 Apr 2012
Dollond, John 10 June 10
Dollond, Peter 10 June 10, 26 July 22
patented mirror mounting 26 July 22
double sextant 16 Jul
micrometer mechanism of 16 Jul 09
handle of 16 Jul 09
mirrors of 16 Jul 09
optical paths of 16 Jul 09
telescope of 16 Jul 09
distance meter,
Fiske 13 Nov 12
Fleuriais 4 Nov 12
Stuart 13 Nov 12, 13 July 12
drawings, of SNO-T mirror adjusting screw and bush 17 april 10
drill, slot, use of 17 April 10
error, index, adjustment 1 Oct 14, 26 July 22
side, adjustment 1 Oct 14, 26 July 22
perpendicularity, adjustment 1 Oct 14, 26 July 22
errors, of worm 12 Mar 09
Entandrophragma cylindricum, see sapele
eyepiece
micrometer 22 Mar 09
monocular, disassembly 18 Nov 09
positioning 18 Nov 09
of C Plath’s earliest sextant April 21 2017
fake C Plath sextants 14 July 10
La Filotecnica Salmoiraghi 5 Oct 10
Filby, David 13 Nov 12, 21 April 2017
float glasss 11 Feb 09
Florez, Luis de 30 May 09
Francis Barker ,sextant, small craft precision 14 June 15
frame,
aluminium alloy 29 Sept 10, 13 Nov 12, 14 June 15
bent 20 Mar 11
braced 10 June 10
bronze 29 Sept 10, 13 Nov 12
curve bar pattern 28 Jan 10
Dreikreis 24 Jan 10
of C Plath’s earliest sextant 21 April 2017
evolution of 29 Sept 10
of Freiberger Skalensextant 22 Mar 09
of La Fil0tecnica 5 Oct 10
plastic 29 Sept 10
pressure die cast 26 Oct 08, 29 Sept 10
stiffness of Heath sextant 28 Jan 10
of Plath sextant 28 Jan 10, 14 June 15
of tulip pattern 10 Nov 09
of US Maritime Commission sextant 15 Dec 10
Freiberger , yacht sextant 14 June 15, 10 Aug 11,
skalen sextant 4 Apr 10
drum sextant 22 Mar 09
Lighting unit of 10 June 2020
Gavrisheff dip meter 5 Apr 2012
Gilbert and Company 10 June 10
glass, float 11 Feb 09, 27 Jan 09
graduations, sextant, refilling 18 Nov 09
grinding paste, for circular mirror 27 Mar 11
Hall, Chester Moor 10 June 10
handle
detachable 1 Oct 14
kinematic mounting of 20 Mar 11
of double sextant 16 July 09
of Gilbert sextant 10 June 10
of La Filotecnica sextant 5 Oct 10
of Troughton and Simms sextant 28 April 10
of US Maritime commission sextant 15 Dec 10
of WWII C Plath sextant 14 July 10
Heath curve bar sextant,
frame stiffness 28 Jan 10
tangent screw 28 Jan 10
Heath
micrometer shaft bearings 24 May 09, 5 May 09
rack 24 May 09
swing arm bearings 5 May 09
vernier sextant 23 Nov 08
Hughes
Admiralty pattern sextant, vernier 27 Mar 11, 24 June 11
micrometer 14 Feb 18
lamp switch assembly 18 Feb 10
micrometer mechanism 18 Feb 10, 18 Feb 18
rack 3 Jan 09
telescope mounting 18 Feb 10
index arm
Ilon Industries Mark III sextant 1 Oct 14 14 Jun 15
index arm, bearing 18 Feb 10, 22 Nov 08, 14 June 15
C Plath 14 July 10, 13 Nov 12, 14 June 15
SNO-M 14 July 10
US Maritime Commission 15 Dec 10
index mirror turntable 10 June 10
sealed 24 June11, 14 Jun 15
joint, corner rebate 11 Aug 09
Keeper, index arm 14 June 15
, swing arm 14 June 15
lacquer, see paint
lamp assembly, making new for Husun 18 Feb 10
latches, of case 18 Feb 10, 24 June 11
left-handed sextant 2 Dec 08
legs,
broken, mending 7 Oct 16
turning new 24 Jan 10
placement of 6 May 09, 26 Apr 09, 2 Dec 08
Lenoir, Etienne 26 July 22
lens,
auxiliary 30 May 09
re-cementing 24 Jan 10
swaging 24 Jan 10
achromatic, airspaced 10 June 10
Leupold and Stevens see US Maritime Commission sextant, 15 Dec 10
level, spirit 30 May 09
sensitivity of 30 May 09
light path, in Ilon Mark III sextant 1 Oct 14
lighting, of scale 30 May 09
limb, rivetted to frame 10 June 10
chromium plated 5 Oct 10
logo, probable fake Plath 14 July 10
of La Filotecnica Salmoirhagi 5 Oct 10
lost motion See backlash
makers names 10 Nov 09
mandrel, test 20 Mar 11
meter, dip, an improvised 5 Apr 2012
Gavrisheff 5 Apr 2012
Russian naval 23 Jun 2012
micrometer
eyepiece 22 Mar 09, 13 Feb 11
sextant
bearing, by C Plath 20 Mar 11
bent 20 Mar 11
calibration of 6 July 09
drum, making new, dividing 20 Mar 11
numbering 20 Mar 11
evolution of 3 Jan 09
examination of 6 July 09
index, bent 20 Oct 16
mechanism 18 Feb 10, 14 June 15
of Husun 3 Jan 09
of Ilon Industries Mark III 1 Oct 14
by Carl Plath 3 Jan 09, 13 Nov 12
shaft, bearings, by Heath 24 May 09, 5 May 09
bent, repair of 20 Oct 16
by La Filotecnica 5 Oct 10
by C Plath 20 Mar 11
setting errors of 13 Feb 1
of US Maritime Commission sextant 15 Dec 10
version of Admiralty pattern sextant 15 Feb 18
worm, axial play in 14 June 15
Micrometre a reflexion, Fleuriais’ 4 Nov 12
mirror,
adjusting screws, of SNO-T 17 April 10
auxiliary 30 May 09
backing of brass sheet, 15 Dec 10
blank, preparation of circular 27 Mar 11
bracket, Ilon Mark III sextant 1 Oct 14
bracket, SNO-T, repair of 17 April 10
Observator, repair of 20 Oct 16
bracket, C Plath casting numbers 14 July 10
circular, cutting 27 Mar 11
first surface 1 Oct 14
f latness of 27 Jan 09
grinding edges 11 Feb 09
horizon, C19 mounting assembly 10 Nov 09
Gilbert method of adjusting 10 June 10
Overcoated 13 Nov 12
Plath and SNO-M compared 14 July 10
sealed 24 June11
index, of Troughton and Simms sextant 28 April 10
, , adjustment 14 June 15
adjustment by turntable 10 June 10
making new 11 Feb 09
removing silvering from 11 Feb 09
rounding corners 11 Feb 09
sealed 6 May 09, 24 June 11
Mk IX A sextant restoration manual 17 Nov 08
magnifier, scale, mounting in vernier sextant 24 June 11
monocular
eyepiece disassembly 18 Nov 09
labyrinth seal of objective lens 20 Mar 11
La Filotecnica 5 Oct 10
mounting, 18 Nov 09
Freiberger, boring 18 Nov 09
marking out 18 Nov
milling and shaping 18 Nov 09
squareness 18 Nov 09
prismatic, in Ilon sextant 1 Oct 14
prismatic, making 18 Nov 09
removing objective 18 Nov 09
removing prisms 18 Nov 09
separating halves 18 Nov 09
Tamaya etc 28 Jan 09
mounting, of Husun telescope 18 Feb 10
of La Filotecnica telescopes 5 Oct 10
Navistar professional sextant 13 Nov 12
objective, removing from monocular 18 Nov 09
octant, aeronautical, Mark I Mod 3 2 Dec 08
O rings, Viton 13 Oct 10
Neoprene 13 Oct 10
Nut , half 26 July 22
paint
defective 15 Dec 10
for sextant finishing 24 Jan 10,10 Nov 09
photoluminescent 9 Dec 08, 26 Oct 08
wrinkle finish 18 Feb 10
Parallax, solar 4 Nov 12
Perpendicularity, archaic method of adjustment. 26 July 22
Plath
Dreikreis sextant 24 Jan 10, 13 Nov 12
Eighty years of
logo 24 Jan 10, 14 July 10
optics of, post WWII 20 Mar 11
sextant frame stiffness 28 Jan 10
sextant production, WWII 14 July 10
shades adjusting tool 6 Oct 13
tangent screw mechanism 24 Jan 10, 24 June 11
telescope rise and fall mechanism 24 Jan 10, 24 June 11
polish, French 24 Jan 10
Porro, Ignacio 5 Oct 10
Poulin, Roger 29 June 14, 14 June15
pressure die casting 26 Oct 08,
working life of dies 14 July 10
prism, eyepiece, of AN5851 9 Dec 08
Blish 5 Apr 2012
Roof 23 Apr 2012
removing from monocular 18 Nov 09
protractor, three armed. See station pointer
quintant, vernier 30 May 09
rack,
Hezzanith 3 Jan 09
Hughes 3 Jan 09
Heath 24 May 09
Ilon Industries 1 Oct 14
C Plath Yachting sextant 14 June 15
radium
paint, decay of 9 Dec 08
half life of 9 Dec 08
release catch
of La Filotecnica sextant 5 Oct 10
of US Maritime Commission sextant 15 Dec 10
of C Plath yachting sextant 14 June 15
Repsold 13 Nov 12
rising piece
bent, repair of 28 Apr 10, 20 Oct 16
collimating, 2 Sept 11
faulty construction of Tamaya 2 Sept 11
structure of, in Admiralty pattern sextant 24 June11
of Carl Plath’s earliest sextant 21 April 2017
in Ilon Industries sextant 1 Oct 14
in La Filotecnica sextant 5 Oct 10
in Troughton and Simms sextant 28 Apr 10
Salmoiraghi, Angelo 5 Oct 10
sapele 24 Jan 10
Saron, Bochard de 26 July 22
scales,
glass 22 Mar 09
ivory 10 Nov 09
screwcutting conical threads 6 July 09
screws,
broken, removal of 24 May 09, 17 April 10, 20 Oct 16
grub, replacement of 4 Mar 10
pin 29 Apr 10
tangent, of Troughton and Simms sextant 28 Apr 10
of French sextant 26 July 22
of C Plath’s earliest sextant 21 April 2017
Service, US Maritime 15 Dec 10
sextant
Admiralty pattern 27 Mar 11
calibration of 13 Feb 11
cleaning of 23 Nov 08, 18 Feb 10
double. See double sextant
fake 14 July 10
left handed 2 Dec 08
small craft 14 June 15
survey. See survey sextant
Yachting 14 June 15
shades,
assembly of horizon 18 Feb 10
assembly of index 18 Feb 10
bracket, construction of 28 Nov 2020
carrousel of AN5851 14 May 09
remounting index 18 Feb 10
repainting 18 Feb 10
shellac, sealing bubble chambers with 20 Dec 08
secondary sealing bubble chambers with 13 Oct 10
Simms, William 29 Apr 10
Skalensextant, Freiberger 22 Mar 09
bearing of 22 Mar 09
dimensions of 22 Mar 09
optical path of 22 Mar 09
prism, cleaning of 4 Mar 10
scale
lighting 22 Mar 09
focus screw, access to 4 Mar 10
focus of 4 Mar 10
SNO-M sextant (Navigation sextant with illumination, marine)
compared to C Plath 26 Oct 08
origins of 26 Oct 08
telescope of 26 Oct 08
SNO-T sextant (Navigation sextant with illumination – tropicalised)
index arm bearing of 22 Nov 08
instrumental accuracy of 22 Nov 08, 13 Feb 11
micrometer of 22 Nov 08
mirror adjusting screws 17 April 10
use of 17 April 10
repair of 17 April 10, 28 Nov 2020
drawing of 17 april 10
origins of 22 Nov 08
position of index arm 22 Nov 08
telescopes of 22 Nov 08
spring,
of tangent clamp 10 Nov 09
material of 10 June 10
of swing arm chassis 12 Mar 09
pre-load, of worm shaft 12 Mar 09, 15 Dec 10
Stanley, W F and Co, merger with Heath 26 Apr 09
station pointer 26 Apr 09
survey sextant 6 May 09, 26 Apr 09, 28 Apr 10
frame of 6 May 09
handle of 6 May 09
placement of legs 6 May 09
telescope mounting of 6 May 09
use of 26 Apr 09
swaging, of lens 24 Jan 10
swing arm
of Observator sextant 20 Oct 16
bearings, Heath 5 May 09
chassis 12 Mar 09
Ilon Industries 1 Oct 14
keeper 14 June 14
switch, lamp, of Husun 18 Feb 10
Tamaya, faulty rising piece, 2 Sept 11
tangent screw,
Heath 28 Jan 10
Hezzanith endless 3 Jan 09
Hughes Admiralty pattern 24 June 11
of C Plath’s earliest sextant 21 April 2017
taper pin,
removal 18 Dec 08
replacement 18 Dec 08
sealing bubble unit with 5 Oct 10
telescope,
bracket, filing to correct collimation 28 Nov 2020
collimation of 2 Sept 11, 28 Nov 2020
making 23 Nov 08
Galilean, optics of 30 May 09
of C Plath’s earliest sextant 21 April 2017
of C Plath WW II sextant 14 July 10
of C Plath yachting sextant 14 June 15
of Hughes Admiralty pattern sextant 24 June 11
of La Filotecnica Salmoiraghi sextant 5 Oct 10
of SNO-M sextant 26 Oct 08
of SNO-T sextant 22 Nov 08
of US Martitime Commision sextant 15 Dec 10
Willson bubble 2 Dec 08
telescope mounting
of survey sextant 6 May 09
Husun 24 Jan 10
telescope rise and fall mechanism, Plath 24 Jan 10
Admiralty pattern 24 June11
thread, interrupted of telescope mounting 5 Oct 10, 24 June 11
internal, measuring of 26 July 22
tool, shades adjusting, Plath 6 Oct 13
Troughton, Edward 28 Apr 10, 10 June 10
Troughton, John 28 Apr 10
US Maritime Commission 15 Dec 10
US Maritime Service 15 Dec 10
US Navy Bureau of Ships Dec 10
Védy, of Paris 26 July 22
vial, of spirit level 30 May 09
washer, Belleville 18 Feb 10, 26 July 22
lead, for sealing filling hole in A10 bubble unit 13 Oct 10
making 11 Aug 09
Wild, Heinrich 22 Mar 09
Willson bubble telescope 2 Dec 08
Wollaston, William 10 June 10
worm
bent shaft of 6 July 09
burrs on 6 July 09
cutting new 6 July 09
errors 12 Mar 09
Hughes 3 Jan 09
Ilon Industries 1 Oct 14
periodic error of 6 July 09
progressive error of 6 July 09
xylene,
effects on plastic 18 Dec 08
refilling bubble chamber with , 18 Dec 08, 13 Oct 10
resistance of Viton to, 13 Oct 10
The Nautical Sextant 
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