NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Another sight reduction analog device
From: Alexandre Eremenko
Date: 2012 Apr 27, 21:51 -0400
From: Alexandre Eremenko
Date: 2012 Apr 27, 21:51 -0400
It is called an Astrohraph, and the book by M. D. Wright says: "The only mechanical reduction device to achieve wide acceptance was the astrograph". http://www.flightglobal.com/pdfarchive/view/1943/1943%20-%202376.html This it says after discussing the Hagner position finder and citing Weems's opinion on it which more or less coincides with my opinion of such devices which I stated in my previous message, except that I tried to be more polite than Weems:-) Few pages earlier the book however says on Bygrave rule, that "two Britain's most famous navigators, Chichester and D. Bennett relied on Bygrave rule", they mean Chichester as an airplane navigator, of course. Now I recall that astrographs were also mentiones in Soviet navigation books (Marine navigation!). Alex.