Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 25-06-2024, 06:31   #1
Registered User

Join Date: Jun 2024
Posts: 1
Restoring (resivering) sextant mirrors.

I have a Plath Navistar Professional I have owned since 1978. It has been stored for many years and the mirrors have become mottled and unclear. I have encountered difficulty buying replacement mirrors or having them reconditioned. Does anyone know of an outlet that can sell me new mirrors or recondition them? Perhaps someone knows a process to do it myself. Thank You in advance.
Jungboy is offline   Reply With Quote
Old 25-06-2024, 09:54   #2
Registered User
 
SeanPatrick's Avatar

Join Date: Dec 2012
Location: Norfolk, VA USA
Posts: 686
Re: Restoring (resivering) sextant mirrors.

Welcome aboard!



Bill Morris has a blog post detailing how to do it yourself. But he also wrote:

Quote:
Originally Posted by Bill Morris
However, for rectangular mirrors at least, it is much simpler to cut new mirrors from 4 mm modern float glass mirror stock. Float glass seems to be flat enough for the purpose, as exposed in the post "How flat are sextant mirrors?" I suspect that much mirror glass from scientific suppliers is just common float glass such as can be had at very little cost by speaking nicely to your local glazier.
__________________
If you have any questions about celestial navigation, ask me!
Celestial Navigation Spreadsheet
NavList Celestial Navigation Forum
SeanPatrick is offline   Reply With Quote
Old 25-06-2024, 11:59   #3
Registered User

Join Date: Feb 2015
Posts: 51
Re: Restoring (resivering) sextant mirrors.

Sextant mirrors are surface mirrors, that is the actual mirror is on the surface of the glas not its back surface.
Epikur is offline   Reply With Quote
Old 26-06-2024, 21:28   #4
Moderator
 
Jim Cate's Avatar

Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 21,358
Re: Restoring (resivering) sextant mirrors.

Not sure, but IIRC there is a section in Bowdich about re-silvering. Not on board right now so can't check it for you.

Jim
__________________
Jim and Ann s/v Insatiable II, lying Port Cygnet Tasmania once again.
Jim Cate is offline   Reply With Quote
Old 26-06-2024, 23:35   #5
Moderator and Certifiable Refitter
 
Wotname's Avatar

Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 21,088
Re: Restoring (resivering) sextant mirrors.

Welcome aboard CF Jungboy.

It would help if we knew where you are however here is one place in the USA and another in the UK.

https://www.robertwhite.com

https://bcookeandson.co.uk/services/...-refurbishment
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
Wotname is offline   Reply With Quote
Old 27-06-2024, 00:55   #6
Moderator and Certifiable Refitter
 
Wotname's Avatar

Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 21,088
Re: Restoring (resivering) sextant mirrors.

And if you are in Europe - https://shop.cassens-plath.de/en/blo...service-repair
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
Wotname is offline   Reply With Quote
Old 27-06-2024, 17:31   #7
Registered User
 
SeanPatrick's Avatar

Join Date: Dec 2012
Location: Norfolk, VA USA
Posts: 686
Re: Restoring (resivering) sextant mirrors.

Quote:
Originally Posted by Epikur View Post
Sextant mirrors are surface mirrors, that is the actual mirror is on the surface of the glas not its back surface.

Some are first surface mirrors, most are not.
__________________
If you have any questions about celestial navigation, ask me!
Celestial Navigation Spreadsheet
NavList Celestial Navigation Forum
SeanPatrick is offline   Reply With Quote
Old 27-06-2024, 17:41   #8
registered user
 
HankOnthewater's Avatar

Join Date: Dec 2012
Location: back in West Australia
Boat: plastic production boat, suitable for deep blue water ;)
Posts: 1,140
Re: Restoring (resivering) sextant mirrors.

I have the same problem as Jungboy, but have a different sextant (Saura). Once I asked a glazier. He was not interested and could not offer further advice.
Anyone knows a place in Oz for this kind of repair/replace?

Thank you SeanPatrick for post #2, as always, your contributions are very helpful.
__________________
Wishing you all sunny skies above, clear water below, gentle winds behind and a safe port ahead,
and when coming this way check https://www.cruiserswiki.org/wiki/Albany,_Australia
HankOnthewater is offline   Reply With Quote
Old 27-06-2024, 18:12   #9
Moderator and Certifiable Refitter
 
Wotname's Avatar

Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 21,088
Re: Restoring (resivering) sextant mirrors.

Quote:
Originally Posted by HankOnthewater View Post
I have the same problem as Jungboy, but have a different sextant (Saura). Once I asked a glazier. He was not interested and could not offer further advice.
Anyone knows a place in Oz for this kind of repair/replace?

Thank you SeanPatrick for post #2, as always, your contributions are very helpful.
While I doubt there are any 'sextant repairers*' in Australia anymore, if you remove the mirrors, it might be possible for either of these guys to restore the mirrors.

https://www.decomirrors.com/re_silvered.html
http://mirrorresilvering.com.au

*A sextant is very basic instrument and mechanical instrument fitter worth their salt would probably be happy to use their skills to do any repairs necessary. These guys hide out in vintage car instrument / general aviation instruments / clock / gunsmith repair places. Sometimes you have to hunt them down .
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
Wotname is offline   Reply With Quote
Old 28-06-2024, 19:09   #10
Registered User
 
SeanPatrick's Avatar

Join Date: Dec 2012
Location: Norfolk, VA USA
Posts: 686
Re: Restoring (resivering) sextant mirrors.

Quote:
Originally Posted by HankOnthewater View Post
Anyone knows a place in Oz for this kind of repair/replace?
Bill Morris (the guy I mentioned up-thread) lives in New Zealand. I'm quite sure that he could help you find a reputable local who could do the job, if not help you directly.

Quote:
Originally Posted by HankOnthewater View Post
Thank you SeanPatrick for post #2, as always, your contributions are very helpful.
Always glad to help! Cheers!
__________________
If you have any questions about celestial navigation, ask me!
Celestial Navigation Spreadsheet
NavList Celestial Navigation Forum
SeanPatrick is offline   Reply With Quote
Reply

Tags
sextant

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Mirrors on Boats silverp40 Construction, Maintenance & Refit 25 06-04-2023 19:37
New bathroom mirrors backing peeling off! Fix? MarkJ Construction, Maintenance & Refit 23 05-10-2017 22:02
Mirrors Dockhead Construction, Maintenance & Refit 8 22-01-2016 23:39
For Sale: Cassens & Plath Sextant 2008 Standard Mirrors benjiwoodboat Classifieds Archive 1 29-09-2011 13:08
New Electronics / Nav System . . . Smoke and Mirrors ? Stirfryd Marine Electronics 4 30-07-2010 16:29

Advertise Here


All times are GMT -7. The time now is 06:43.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.