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and is now owned by Pyser Optics
and its service pattern leather case
The compass can be dated quite accurately to c
clocks and aircraft instruments
Its mirror and pin sighting arrangement was said to enable objects to be sighted more easily and with greater accuracy than other similar instruments
Prismatic Artillery Survey Compass c.1885 Anti-submarine and is now owned byA prismatic survey or artillery compass, dating from c. 1885. This type of compass was used for surveying and artillery work in the mid to late 19th century. The compass features a blackened or 'bronzed' finish brass case with a push fit lid, Singer's type black and white compass card, prism and vane sights, and a transit lock operated when the sights are folded down. The compass card is an unusual design most of the prismatic compasses of this type
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