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Alidade

NAV1442.3

Object connections:

Collection
Gallery locationNot on display

Object details:

Object ID NAV1442.3
Description 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.
Date made ca.1780

Place made London, Greater London, England, United Kingdom
Credit National Maritime Museum, Greenwich, London
Materials metal
Measurements Overall: 51 x 513 x 126 mm
Parts
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