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Calculating rule, 1826-1851.

Calculating rule, 1826-1851.
4 0 c m
actual image size: 26cm x 32cm


A calculating machine invented by B B Catt of Ipswich, Suffolk and made by J Tree of London, of ebony, ivory and silver. The device allows rapid solution of plane trigonometrical problems, and the construction of triangles to scale.

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© Science Museum / Science & Society Picture Library

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