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Title: Ready reckoner 'Prompt' calculator, 19th century. [Go to resource]
Description: Ready reckoner "Prompt" calculator invented by Am. Maurand for converting between British Imperial Measure and the French Metric System, French, 19th century. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: ready reckoners (weights & measures) Temporal: c.1863 Source: Science Museum Creator: A.M.Maurand Identifier: http://collectionsonline.nmsi.ac.uk/grab... Go to resource More Like this...
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