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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.

   

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