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Alidade
alidade
Heavy grey painted brass, with crosspiece at centre which has a brass spigot on its underside that fits into depression at centre of compass verge glass. On upper side of cross-piece is a location for a shadow pin. The foresight is an open arch with thread and is fitted with a black glass reflector and mirror. The back sight contains a slit, prism and two filters.
O.A. Height 7.1" (18.0 cm)
In fitted wooden box 12.8" x 5.5" x 6.3" (32.5 x 14.0 x 16.0 cm) containing two shadow pins.
Heavy grey painted brass, with crosspiece at centre which has a brass spigot on its underside that fits into depression at centre of compass verge glass. On upper side of cross-piece is a location for a shadow pin. The foresight is an open arch with thread and is fitted with a black glass reflector and mirror. The back sight contains a slit, prism and two filters.
O.A. Height 7.1" (18.0 cm)
In fitted wooden box 12.8" x 5.5" x 6.3" (32.5 x 14.0 x 16.0 cm) containing two shadow pins.
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Object Details
| ID: | ACO0837 |
|---|---|
| Type: | Alidade |
| Display location: | Not on display |
| Creator: | Plath, C. |
| Date made: | circa 1945 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 130 mm x 260 mm x 100 mm |
| Parts: | Alidade |
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