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Prismatic alidade
An instrument of the Schmalcalder type. This instrument has the prism and shades on the back sight, which is a slit and spyhole. The open arch and thread fore sight also carries the celestial reflector. The diameter is cut away but has a crossbar at centre to hold the hole which accommodates the compass spigot. The thread runs along the complete diameter.
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Object Details
| ID: | ACO0709 |
|---|---|
| Type: | Prismatic alidade |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | circa 1920? |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 116 mm x 230 mm x 36 mm |
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