Navigation slide rule, c 1800.

Image number: 10328101

Navigation slide rule, c 1800.

'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.

Image number:
10328101
Credit:
Science Museum/Science & Society Picture Library
Date taken:
20 October 2003 19:11
Image rights:
Science Museum
 

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