NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Another crazy sextant pic
From: Gary LaPook
Date: 2015 Oct 26, 16:53 +0000
From: Lu Abel <NoReply_LuAbel@fer3.com>
To: garylapook@pacbell.net
Sent: Monday, October 26, 2015 8:52 AM
Subject: [NavList] Re: Another crazy sextant pic
From: Gary LaPook
Date: 2015 Oct 26, 16:53 +0000
It's a standard "clamp screw vernier" sextant. You release the clamp and move the index arm until the sun is close to the horizon in the horizon mirror and the tighten up the clamp. Then you make fine adjustments with the screw. The range of adjustment is limited by the length of the screw so you want it set to mid range before you clamp the index arm .
gl
From: Lu Abel <NoReply_LuAbel@fer3.com>
To: garylapook@pacbell.net
Sent: Monday, October 26, 2015 8:52 AM
Subject: [NavList] Re: Another crazy sextant pic
I forwarded the link to some friends who know celestial but are not NavList members.
When one inserts a link into Yahoo mail, it actually shows the first few lines of the link's contents, not just the URL itself. For some weird reason, this Yahoo expansion showed a taller picture - uncropped at the bottom - of the sextant user:
From that, you can see that this thoroughly modern sextant such as our midshipmen will be using does not have a micrometer drum!!! Welcome to the 19th century...
From: Paul Saffo <NoReply_PaulSaffo@fer3.com>
To: luabel{at}ymail.com
Sent: Sunday, October 25, 2015 3:52 PM
Subject: [NavList] Another crazy sextant pic
See this link in the LA Times, the latest in all the chit-chat about the USNA "teaching" CelNav: http://www.latimes.com/nation/la-na-celestial-navigation-20151025-story.htmlNote the pic of the sextant... the scope has been screwed in backwards!
