NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Sextant frames
From: Jeremy C
Date: 2009 Apr 16, 09:19 -0700
From: Jeremy C
Date: 2009 Apr 16, 09:19 -0700
Brad wrote: > > As indicated in the Sextant Handbook, you should allow the sextant to reach > stable temperature before use. �The reason is exactly that, the thermal coefficient of expansion. > The sextant should not be warmed in the sun, as one side will be warmer than the other. > Of course this is optimum, however there are many times that I am running from the deck to lunch to shoot LAN in a span of 20 minutes, and if the bridge is a temperate 20 C and outside it is 35 or so, all I have time to do is let the mirrors warm sufficently to get rid of the fog and then look for LAN. I was just wondering if there was a difference that I needed to be concerned about. It is good to know that it won't significantly affect my sights, at least to a degree that isn't overshadowed by scatter or other issues. Jeremy --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
