Alidade
Alidade for the plane table. Alidade-Length 20.25" (51.4cm). Brass, graduated on upper surface 30-90, 25-90, 20-14, 16-11, 12-8. Also a diagonal scale. Sight vanes-Two sight vanes, attached to alidade by brass screws, 4.8" (12.2cm) long. One vane has a vertical slit with rectangular aperture above (complete with thread), the other vane has a rectangular aperture (complete with thread) with a vertical slit above.
Object Details
| ID: | NAV1442.3 |
|---|---|
| Type: | Alidade |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | circa 1780 |
| Credit: | National Maritime Museum, Greenwich, London |
| Measurements: | Overall: 51 x 513 x 126 mm |
| Parts: | Plane-table |
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