Circular slide rule, c 1870.
3 4 c m
actual image size: 32cm x 26cm

Circular slide rule, c 1870.

© Science Museum / Science & Society Picture Library


A circular slide rule made by Apps. A circular slide rule affords a long and therefore accurate logarithmic line in a small amount of space. The potential of circular rules was not really utilized until the Victorian period, when several spiral and helical designs appeared on the market.

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