Circumferentor sight vane

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Circumferentor alidade sight vane with a vertical slit with a rectangular aperture below (threaded).

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ID:	NAV1377.2
Type:	Circumferentor sight vane
Display location:	Not on display
Creator:	Unknown
Date made:	Unknown
Credit:	National Maritime Museum, Greenwich, London, Caird Collection
Measurements:	Overall: 24 mm x 35 mm x 113 mm
Parts:	Circumferentor Circumferentor sight vane (NAV1377.1) Circumferentor sight vane (NAV1377.2) Circumferentor sight vane (NAV1377.3) Circumferentor sight vane (NAV1377.4) Circumferentor glass (NAV1377.5) Circumferentor compass needle (NAV1377.6) Circumferentor box (NAV1377.7)