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U.S.AIRFORCE TYPE D APERIODIC COMPASS AS USED ON THE B-12 BOMBER, CIRCA 1943, ORIGINAL, WORKING, . 18.5 CMS X 18.5 CMS X 11.2 CMS, CONDITION" VERY GOOD.
A aperiodic compass is without a period, that is, a compass that, after being deflected, returns by one direct movement to its proper reading, without oscillation., also known as deadbeat compass.
All metal and has weight, ie not light.