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Alidade
alidade
A heavy grey painted brass alidade with wide cross piece which holds spigot to fit into compass verge glass and a locking lever. The fore sight is an open frame with thread, with a dark glass and mirror for celestial observations. Back sight contains slit, peep-hole with prism and dark shades.
For use on small repeaters associated with Plath and Patin transmitting magnetic compasses.
(see ACO2524 and 548)
O.A. Height 6.5" (16.5 cm)
In fitted wooden box 9.1" x 5.5" x 5.5" (23.2 x 14.0 x 14.0 cm) : containing two shadow pins.
A heavy grey painted brass alidade with wide cross piece which holds spigot to fit into compass verge glass and a locking lever. The fore sight is an open frame with thread, with a dark glass and mirror for celestial observations. Back sight contains slit, peep-hole with prism and dark shades.
For use on small repeaters associated with Plath and Patin transmitting magnetic compasses.
(see ACO2524 and 548)
O.A. Height 6.5" (16.5 cm)
In fitted wooden box 9.1" x 5.5" x 5.5" (23.2 x 14.0 x 14.0 cm) : containing two shadow pins.
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Object Details
| ID: | ACO0822 |
|---|---|
| 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: 100 mm x 170 mm x 100 mm |
| Parts: | Alidade |