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

Circular slide rule, 1660-1680.

Hills, Jennie

© Science Museum / Science & Society Picture Library


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.



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