Found this website with some information on aircraft compass that may be of use to some..
http://www.compassmuseum.com/aero/aero.htm
19 years 1 month
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By: Arabella-Cox - 19th August 2014 at 22:31
That’s an interesting site and subject, Brian. Thanks for posting.
Anon.
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August 19, 2014 at 8:58 am