Ready reckoner 'Prompt' calculator, 19th century.
3 4 c m
40cm
actual image size: 32cm x 26cm

Ready reckoner 'Prompt' calculator, 19th century.

Hills, Jennie

© Science Museum / Science & Society Picture Library

Description

A ready reckoner invented by A M Maurand for converting between British Imperial Measures and the French Metric System.
 

Artist

 

Image Ref.

10328952
 

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