Lot 736: T. Wheeler 1940 British Military Pocket Aneroid Barometer Altimeter

A British military pocket surveying aneroid barometer-altimeter manufactured by T. Wheeler, London. The instrument features a cylindrical brass case with a knurled rotating bezel used to adjust the zero point for altitude. It is fitted with a glass crystal over a silvered metal dial. The dial is printed at the centre COMPENSATED / T. WHEELER / Scientific Insts. LTD / LONDON / B. 710 / 1940. It features a single blued-steel indicator needle and two primary scales. The outer altitude scale is calibrated in feet from 0 to 10,000 with 20-foot divisions. The inner barometric pressure scale is calibrated in inches of mercury from 21 to 31. The side of the case is fitted with a small brass suspension ring. The underside of the brass case is stamped with a broad arrow mark, which is a British government property mark, though the surrounding metal is heavily scratched and oxidised.