Wheeler barometer altimeter with finely engraved, silvered brass 2½” dial with twin scales, the inner calibrated from 20-31 inches of mercury, the rotating outer calibrated from 0-12,000ft, fine blued-steel pointer, rotating bezel carrying the outer altitude scale, with knurled outer ring. The spun brass lacquered case marked to rear with “A.M.” surmounted by the Royal Crown and followed by “Ref No 6B/114, Barometer Aneroid Pocket, Mark I, T. Wheeler, London, No 138/39,” turned brass pillar with suspension ring. Contained in its original, brown leather case with maroon velvet lining and marked “A.I.D.95.V” within a rectangular border.
These barometric instruments were made as part of an Air Ministry Contract (RAF). Since this is definitely an altimeter there is little doubt that it had an aeronautical application, and the annotation “A.I.D.” may relate to the Aeronautical Inspection Department, perhaps to assess and/or calibrate an aircraft cockpit altimeter. These are seldom seen and very rarely in essentially unissued condition. This Wheeler altimeter is very much a collector’s piece.
Dimensions: 2¾” diameter x 1″ deep
Stock No: PB0247
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