Bisaker's slide rule, 1654, and Thacher's calculating instrument, 1881.

Bisaker's slide rule, 1654, and Thacher's calculating instrument, 1881.
3 0 c m
40cm
actual image size: 32cm x 22cm

Description

Bisaker's slide rule (bottom) is the earliest dated straight slide rule. The scales are mainly trigonometrical and logarithmic. The instrument is inscribed 'Made by Robert Bisaker, 1654, for TW'. Thacher's slide rule (top) is an extremely important American contribution to slide rules, capable of accurate reading to four decimal places.

© Science Museum / Science & Society Picture Library

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