Compass correction magnet

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Four magnets - three horseshoes and one bar magnet in a cardboard box.

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ID:	NAV0455.5
Type:	Compass correction magnet
Display location:	Not on display
Creator:	Unknown
Date made:	circa 1930
Credit:	National Maritime Museum, Greenwich, London
Measurements:	Overall: 27 mm x 146 mm x 662 mm
Parts:	Compass correction magnet Compass correction magnet (NAV0455.1) Compass correction magnet (NAV0455.2) Compass correction magnet (NAV0455.3) Compass correction magnet (NAV0455.4) Compass correction magnet (NAV0455.5)