The Mountbatten Ruler (Patent Applied For) For Chart Work, etc.

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Parallel rule instruction booklet.

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ID:	NAV0615.1
Type:	Parallel rule instruction booklet
Display location:	Not on display
Creator:	Unknown
Date made:	Unknown
Credit:	National Maritime Museum, Greenwich, London
Measurements:	Overall: 211 mm x 150 mm
Parts:	Parallel rule The Mountbatten Ruler (Patent Applied For) For Chart Work, etc. (Parallel rule instruction booklet) (NAV0615.1) Parallel rule box (NAV0615.2) Parallel rule manufacturer note (NAV0615.3)