Reflecting circle knob

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Reflecting circle knob.

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ID:	NAV0082.5
Type:	Reflecting circle knob
Display location:	Not on display
Creator:	Unknown
Date made:	Unknown
Credit:	National Maritime Museum, Greenwich, London
Measurements:	Diameter: 18 mm;Overall: 17 mm
Parts:	Reflecting circle Reflecting circle box (NAV0082.1) Reflecting circle shaded eyepiece (NAV0082.2) Reflecting circle shaded eyepiece (NAV0082.3) Reflecting circle support (NAV0082.4) Reflecting circle knob (NAV0082.5)