Mining compass vernier fixing knob

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ID:	NAV0372.2
Type:	Mining compass vernier fixing knob
Display location:	Not on display
Creator:	Unknown
Date made:	Unknown
Credit:	National Maritime Museum, Greenwich, London
Measurements:	Diameter: 18 mm;Overall: 22 mm
Parts:	Bare Needle Type (Mining compass) Mining compass vernier (NAV0372.1) Mining compass vernier fixing knob (NAV0372.2) Mining compass screw (NAV0372.3) Bare Needle Type (Mining compass box) (NAV0372.4)