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
Science Museum Group
© 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