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History
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A foot-long ruler
A foot-long ruler
The unofficial public imperial measurement standards erected at the Royal Observatory in Greenwich in the 19th century
The unofficial public imperial measurement standards erected at the Royal Observatory in Greenwich in the 19th century
Page from Austrian Lehrbuch des gesammten Rechnens für die vierte Classe der Hauptschulen in den k.k. Staaten – 1848 (Combined mathematics textbook fo
Page from Austrian Lehrbuch des gesammten Rechnens für die vierte Classe der Hauptschulen in den k.k. Staaten – 1848 (Combined mathematics textbook for the fourth form of senior schools in the Imperial–royal states.)
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The former Weights and Measures office in Seven Sisters, London
The former Weights and Measures office in Seven Sisters, London
Units of measurement, Palazzo della Ragione, Padua
Units of measurement, Palazzo della Ragione, Padua
An example of metrication in 1860 when Tuscany became part of modern Italy (ex. one "libbra" = 339.54 grams)
An example of metrication in 1860 when Tuscany became part of modern Italy (ex. one "libbra" = 339.54 grams)