Unidentified object

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Unidentified object for theodolite.

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ID:	NAV1464.9
Type:	Unidentified object
Display location:	Not on display
Creator:	Unknown
Date made:	Unknown
Credit:	National Maritime Museum, Greenwich, London
Measurements:	Overall: 3 mm x 28 mm x 40 mm
Parts:	A frame transit (Theodolite) Box (NAV1464.1) Tripod (NAV1464.2) Unidentified object (NAV1464.3) Trough compass (NAV1464.4) Eyepiece (NAV1464.5) Eyepiece disc with three dark shades (NAV1464.6) Extension tube (NAV1464.7) Eyepiece cap? (NAV1464.8) Unidentified object (NAV1464.9) Key (NAV1464.10) Base for oil bottle (NAV1464.11) Lid for oil bottle (NAV1464.12)