Calculating machine for trigonometry made by J. Tree, London and invented by B. B. Catt of Ipswich with case, 1826-1842
Calculating machine for trigonometry made by J. Tree, London and invented by Catt of Ipswich with case, mid 19th century. The device allows rapid solution of plane trigonometrical problems, and the construction of triangles to scale.
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- J.C. Stevens Auction House
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