Ready reckoner 'Prompt' calculator, 19th century.

Made:: circa 1863 in France

Ready reckoner Prompt' calculator invented by Am

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Ready reckoner Prompt' calculator invented by Am
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© The Board of Trustees of the Science Museum

Ready reckoner "Prompt" calculator invented by Am. Maurand for converting between British Imperial Measure and the French Metric System, French, 19th century.

Details

Category:: Mathematics

Object Number:: 2001-796

Materials:: brass, paper, card and complete

Measurements:: overall: 25 x 100 mm

type:: ready reckoners (weights & measures)

credit:: Tesseract

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