Parallel rule

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Ivory with brass rollers. Parallel rule.
Engraved as a protractor.

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ID:	NAV0614
Type:	Parallel rule
Display location:	Not on display
Creator:	Unknown
Date made:	circa 1830
Credit:	National Maritime Museum, Greenwich, London, Rev. George Fisher Collection
Measurements:	Overall: 7 mm x 152 mm x 41 mm