|Title||Astro-Compass MK II|
Astro-Compass Part No. D500 in a wood case.
made by: Sperti. Inc. Cincinnate, Ohio
used on Bombers in WWII
|Notes||At high latitudes, where magnetic variation can be erratic and the angle of magnetic dip can be steep, the magnetic compass is essentially useless. This instrument, on the other hand, indicates true north when pointed at a known star. It was made for military use during World War II, and surplussed soon thereafter.The inscription reads "ASTRO-COMPASS MK II MANUFACTURER'S ASSEMBLY PART NO. D500 CONTRACT NO. W535-AC 36492 SPERTI, INC. CINCINNATI, OHIO, USA."|