Circular slide rule, 1660-1680.

Hills, Jennie

Circular slide rule, 1660-1680.
3 4 c m
40cm
actual image size: 32cm x 26cm

Description

A circular slide rule, made by John Brown, with two bras radial arms and an stronomical quadrant engraved on the back. A spiral slide rule affords a long and therefore accurate logarithmic line in a small amount of space. The potential of spiral rules was not really utilized until the Victorian period, when several spiral and helical designs appeared on the market.

Image Details

Artist
 
Image Ref.
 
10328277

© Science Museum / Science & Society Picture Library

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