NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: UNK
Date: 2015 Jun 2, 06:55 +0100
Thanks Gary for the correction, apologies for the mistake. Apologies also to the poor old navigator! I’ve no experience with bubble or periscope sextants and probably should stick to what I do know! (an element of Procrustes there? I didn’t double check. )
Thanks for starting the string though ,really interesting (and disturbing) from a number navigation, medicine and human behaviour viewpoints.
Francis
From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Gary LaPook
Sent: 01 June 2015 22:07
To: francisupchurch@gmail.com
Subject: [NavList] Re: Navigation errors and Sahara crash 1952
Thank you for that link to the collection of Air Almanacs. But you mis-identified the diagrams found in the 1952 edition. You saw the diagrams of the positions of the stars in the sky, altitude and azimuth, which are the equivelent of HO 2102-D. These are not the view through the periscopic sextant that show the pattern of the stars near the desired star within in the limited field of view of the periscopic sextant. Here is a link to one of the 1952 diagrams.
http://babel.hathitrust.org/cgi/pt?id=uiug.30112106761890;view=1up;seq=268
I researched the other volumes and found that the first time the periscopic diagrams were published in 1970, see:
http://babel.hathitrust.org/cgi/pt?id=uiug.30112106762401;view=1up;seq=317
Then in 1973 they added larger diagrams, see:
http://babel.hathitrust.org/cgi/pt?id=uiug.30112106762500;view=1up;seq=317
So the ill fated navigator didn't have the benefit of these diagrams.
gl
