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Gunner's Folding Rule
Signed by Humfrey Cole
Dated 1575; London
Brass; 188 mm in length

This is one of three surviving gunner's rules by Humfrey Cole, two of which are in the British Museum (see also Epact 21385). They offer a wide range of applications beyond those of an ordinary folding rule which makes them a valuable instrument in surveying, gunnery and trade.

The use of the instrument is best summarized in Cole's own words inscribed on the outside edge of one of the limbs: 'This instrument is a rule a square a peare of Compasses a quadrant to knowe ye howres heights and distances of any thinge ye shotinge of Ordenance to measure'.

British Museum, London
Registration no. MLA 1912,11-1.1

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