Alidade

This instrument consists of an oblong base cut away with a crossbar, swollen, at centre. The crossbar hold the hole which accommodates the compass spigot. both sights are hinged. The back sight is a slit with two spy holes while the fore sight is an open arch with sighting thread. The thread runs along the full length of the base.

Object Details

ID: ACO0710
Type: Alidade
Display location: Not on display
Creator: Unknown
Date made: circa 1930 ?
Credit: National Maritime Museum, Greenwich, London, Admiralty Compass Observatory
Measurements: Overall: 124 mm x 230 mm x 50 mm
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