This very rare brass trough compass was made by J M Glauser for use by the British Military during WW2, and is engraved 'J.M.G & SONS Ltd' with a military broad arrow.
Not used as a traditional compass and known also as a plane table compass, it was used by artillery crews to establish the direction of magnetic North when aligning a plane table or theodolite.
The needle of the compass consists of a long narrow magnetised bar of steel, pointed at both ends, with a gemstone bearing at its centre for reduced friction.
In very good condition, it's housed under glass in a solid rosewood case with a sliding lid and thumb grip.
Size : 17 (L) x 3.5 (W) x 2.8 (H) cm
J.M. Glauser & Sons Ltd. was a British manufacturer. They were contractors to the War Office, Air Ministry, amongst others. The company was established in 1929 by Jean Maurice Glauser, a Naturalized British subject of Swiss origin. The company was wound up in 1956 when the founder retired.
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