The 'Tachylemme' ready reckoner, c 1876.

Hills, Jennie

The 'Tachylemme' ready reckoner, c 1876.
3 4 c m
40cm
actual image size: 32cm x 26cm

Description

Invented by C L Chambon, the 'Tachylemme' was used to calculate the daily interest on sums of money at various rates.

© Science Museum / Science & Society Picture Library

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