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Navigation slide rule, c 1800.

Hills, Jennie

Navigation slide rule, c 1800.
3 4 c m
actual image size: 32cm x 26cm


'Sliding Gunters', or navigator's rules with a slide, such as this 2 foot example in boxwood, are comparatively rare. Most navigators preferred to stick with the ordinary 'Gunter' scale based on the combination of trigonometric, logarithmic and surveying lines suggested by Edmund Gunter in the 1630s.

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© Science Museum / Science & Society Picture Library

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