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Prismatic alidade
Prismatic alidade of the Schmalcalder type fitted for mounting a Colongue deflector on a French marine compass. Consists of a diameter which is cut away and has two hinged sights. The diameter has a crossbar at the expanded centre which attached to the compass spigot and accommodates the deflector.The back sight is fitted with a prism and two shades. The fore sight has a frame with sighting thread and carries a spirit level and reflector.
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Object Details
| ID: | ACO0708 |
|---|---|
| Type: | Prismatic alidade |
| Display location: | Not on display |
| Creator: | L. Doignon & Malakoff |
| Date made: | 1932 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 125 mm x 227 mm x 70 mm |
| Parts: | Prismatic alidade |
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