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Prismatic alidade
This is of the Schmalcalder type. Consists of a diameter which is cut away and two hinged sights. the diameter has a crossbar at the centre which attaches to the compass spigot. The back sight is a slit with a V notch and it also carries the prism and one shade. The fore sight is open arch and thread, the thread runs along the whole length of base.
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Object Details
| ID: | ACO0711 |
|---|---|
| Type: | Prismatic alidade |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | 1928 ? |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 166 mm x 215 mm x 50 mm |
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