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Alidade
alidade.
Heavy brass, painted grey, with cross piece at centre which has lower spike that fits into spigot of compass. The fore sight is open arch with nylon thread and it also has a jet celestial reflector and mirror. The back sight contains slit and spy hole, also prism and filters.
O.A. Height 7" (17.8 cm)
Heavy brass, painted grey, with cross piece at centre which has lower spike that fits into spigot of compass. The fore sight is open arch with nylon thread and it also has a jet celestial reflector and mirror. The back sight contains slit and spy hole, also prism and filters.
O.A. Height 7" (17.8 cm)
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Object Details
| ID: | ACO0819 |
|---|---|
| Type: | Alidade |
| Display location: | Not on display |
| Creator: | Plath, C. |
| Date made: | circa 1940 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 140 mm x 260 mm x 103 mm x 1.3 kg |