Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 23-01-2012, 23:37   #1
Registered User
 
Skipper Solo's Avatar

Join Date: Jan 2012
Location: Oslo, Norway
Boat: Virgo Voyager 23' / Steady 8' dinghy
Posts: 45
Send a message via Skype™ to Skipper Solo
Looking for a Sextant - Finding this Beauty ...

Given that GPS/electronics aren't exactly an eternal given (scroogle "carrington event 1859") I thought it prudent to look for analogue, solid state celestial navigational aids, along with some literature to explain the arcane art. That's when I happened across this: bit.ly/xL0ZBY (ebay) - isn't it just too beautiful for words! but is it actually useable for navigational purposes? Or is it just a pretty toy/eye candy/conversation piece? Looks like a serious piece of hardware to me.
__________________

__________________
Our present economic system is not a natural system: it is a system that was created to serve those that created it. - John Kutyn
Skipper Solo is offline   Reply With Quote
Old 24-01-2012, 07:21   #2
Registered User
 
S/V Alchemy's Avatar

Join Date: May 2008
Location: Toronto
Boat: Custom 41' Steel Pilothouse Cutter
Posts: 4,576
Re: Looking for a sextant - finding this beauty...

And it's in almost prefect condition.

How is this "usable for navigational purposes" any more than a kid's globe from a science toys store?
__________________

__________________
S/V Alchemy is offline   Reply With Quote
Old 24-01-2012, 07:58   #3
Registered User

Join Date: Dec 2011
Boat: 1980 Vagabond 47
Posts: 8
Re: Looking for a sextant - finding this beauty...

these guys Antiques Nautical Maur, sextant, compass, star globe,clinometer, Freiberger, CHO-T, SNO-T, CHO-M, Protractor, sno-m, planometer have one listed for $200. USD, might be a better price. Just fyi;These were not intended to entertain but to instruct sailors in locating and identifying key stars in the firmament. Before this, most could take navigation readings only at noon and in sunlight. With a celestial globe (later called a star-finder) the readings could be taken at night.
"just sayin"
__________________
S.V.Arebesque is offline   Reply With Quote
Old 24-01-2012, 08:37   #4
Moderator
 
nigel1's Avatar

Cruisers Forum Supporter

Join Date: Oct 2009
Location: Manchester, UK
Boat: Beneteau 473
Posts: 5,184
Re: Looking for a sextant - finding this beauty...

Quote:
Originally Posted by S/V Alchemy View Post
And it's in almost prefect condition.

How is this "usable for navigational purposes" any more than a kid's globe from a science toys store?

Agreed, of what use is it to you, its a pretty star finder, a plastic star identifier would be a lot cheaper and easier to use.
__________________
Nigel
Beneteau 473
Manchester, UK
nigel1 is offline   Reply With Quote
Old 24-01-2012, 09:47   #5
Registered User

Join Date: Oct 2010
Location: Oregon
Boat: 57' Laurent Giles Yawl
Posts: 755
Re: Looking for a sextant - finding this beauty...

Quote:
Originally Posted by Skipper Solo View Post
isn't it just too beautiful for words! but is it actually useable for navigational purposes? Or is it just a pretty toy/eye candy/conversation piece? Looks like a serious piece of hardware to me.
It looks serious to me. That it rotates in so many ways with precision ruled lines, and has pencils that go with it... I think it must do something more than a plastic toy.

Maybe you can find instructions on Google, or just... try to work it out. Setup a problem-- look up one of the stars in the almanac, figure out where it would be, place it there on the device, and see if there's something to do.

The problem might be that it may be "backwards" from the way sight reduction is normally done, and so may have had it's own set of reduction tables or almanac in a different form. Though someone suitably nerdy could make current tables or an almanac for it.

Also, keep in mind that aircraft used to use celestial navigation. There are even weird aviation sextants that look like little machines. So this globe may be part of that system-- a way to speed up the calculation for someone who is moving fast. I don't know if they felt they need more or less accuracy for aircraft navigation, but something to keep in mind-- it may be designed for a rougher idea of where you are.

When I was navigating traditionally I ended up making my own forms, since I felt that the forms in the back of books made it more complicated than it needed to be. They seemed to be written for people who did not know basic algebra and wanted an algorithm spelled out as a word problem, which, to me, is more difficult to understand. So if you use this Russian globe I have a feeling you'd have to figure out your own system.


If you have to be conservative with money, I feel that a taffrail log is really nice for traditional navigation (less work and more accurate than a chip log), and probably make a bigger difference in the daily routine than the Russian globe (however beautiful).


Well, good luck with it. I've found a lot of fun in traditional navigation.
__________________
msponer is offline   Reply With Quote
Old 24-01-2012, 10:30   #6
Registered User
 
Skipper Solo's Avatar

Join Date: Jan 2012
Location: Oslo, Norway
Boat: Virgo Voyager 23' / Steady 8' dinghy
Posts: 45
Send a message via Skype™ to Skipper Solo
Re: Looking for a sextant - finding this beauty...

Quote:
Originally Posted by msponer View Post
It looks serious to me. That it rotates in so many ways with precision ruled lines, and has pencils that go with it... I think it must do something more than a plastic toy.
<snip>

Interesting post in many ways, thanks! :-) Did a search for "taffrail log", seem to be called "shark bait" in some quarters - not a problem in my waters, 'tho. And a very useful tool for analog navigation.

As for it not being a toy, you're right; someone (S.V.Arebesque) pointed out that the astrolabe (?) were used for training purposes. Investigating further, at bit.ly/yRup3D it says that it's a "cold war training device used in the Russian Navy and Maritime Service for training in celestial navigation." I.e. a real blast from the past.
__________________
Our present economic system is not a natural system: it is a system that was created to serve those that created it. - John Kutyn
Skipper Solo is offline   Reply With Quote
Old 24-01-2012, 10:54   #7
Registered User

Join Date: Oct 2010
Location: Oregon
Boat: 57' Laurent Giles Yawl
Posts: 755
Re: Looking for a sextant - finding this beauty...

Quote:
Originally Posted by Skipper Solo View Post
Did a search for "taffrail log", seem to be called "shark bait" in some quarters - not a problem in my waters, 'tho. And a very useful tool for analog navigation.
The older cruising books say that painting it black makes it look less delicious to sharks. So I did this, and it was not eaten. We towed it about a third of the way around the world.

The only problem was chafe on the line, where it exits the spinner and the weight. So you have to check it every few days for chafe, and we eventually put some heatshrink tubing on the line to protect it, which worked very well.

A chip log would also work, but I never got that confident with timing and counting knots, it seemed a bit hokey.
__________________
msponer is offline   Reply With Quote
Old 24-01-2012, 10:56   #8
Senior Cruiser
 
IslandHopper's Avatar

Cruisers Forum Supporter

Join Date: Dec 2009
Location: Bundaberg Queensland/Lake Bolac Victoria, Australia
Boat: 45ft Ketch
Posts: 1,199
Re: Looking for a sextant - finding this beauty...

For sure it's no toy.....

My brother, who collects this sort of stuff has one and there is one on display at the Australian Maritime Collage....
__________________

__________________
IslandHopper is offline   Reply With Quote
Reply

Tags
sextant

Thread Tools
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
C. Plath Hamburg Stubbenhuk 25 - 1929 Sextant Mendozaco Product or Service Reviews & Evaluations 9 27-05-2013 07:22
For Sale: Tamaya MS933 Micrometer Sextant livesonjura Classifieds Archive 5 20-01-2012 17:07
For Sale: Astra IIIB Sextant with Many Books and Artificial Horizon - $350usd svmaggieb Classifieds Archive 5 03-11-2011 17:58



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 23:32.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.