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Bearing Plate with alidade
An ingenious extemporised bearing plate found on a French trawler. It consists of a water-tight bulkhead electric light fitting (brass) which has been fitted with gimbals, diameter 12.2" (31cm) and balanced so that its glass is horizontal. The flat glass is fitted with a spigot for an alidade and a paper compass card, graduated 0-180 degrees through E & W, is stuck to its underside. The alidade is of copper with fixed sights, one sight carries a slit; the other an open frame (thread missing).
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Object Details
| ID: | ACO0712 |
|---|---|
| Type: | Bearing Plate with alidade |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | circa 1939 ? |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 190 mm; Diameter: 333 mm |
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