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Mesures usuelles (Template:IPA-fr or ordinary measures) were a system of measurement introduced by Napoleon I in 1812 to act as compromise between the metric system and traditional measurements. The system was restricted to use in the retail industry and continued in use until 1839.

Rationale behind the new system

In the five years prior to the start of the French First Republic's introduction of the metric system into France, every effort was made to inform the citizens of the forthcoming changes and to prepare them for its introduction. The responsible agency had distributed tens of thousands of educational pamplets, Private enterprise had produced educational games, guides, almanacs and conversion aids, and metre standards had been built into the walls of prominent buildings around Paris.. The introduction was done district by district over the ensuing years, with Paris being the first district to change. The agency also realised that the French population would need to be able to acquire metre rulers, but of the 500,000 rulers required in Paris alone, one month after the metre became the sole legal unit of measure, the agency were only able to provide 25,000. To improve the situation, the agency introduced incentives to organisations to mass-produce the rulers, but the quality of the rulers was difficult to ensure, and Paris police reported widespread flouting of the requirement placed on merchants to use only the metric system. Where the new system was used, it was abused, and shopkeepers took the opportunity to round prices up and give smaller measures.

Napoleon I, the French Emperor, disliked the inconvenience of surrendering the high factorability of traditional measures in the name of decimalisation, and recognized the difficulty of getting it accepted by the populace. Under the décret impérial du 12 février 1812 (imperial decree of 12 February 1812), he introduced a new system of measurement, the mesures usuelles or "ordinary measures", for use in small retail businesses. However, all government, legal and similar works still had to use the metric system and the metric system continued to be taught at all levels of education.

The prototypes of the metric unit, the kilogram and the metre, enabled an immediate standardization of measurement over the whole country, replacing the varying legal measures in different parts of the country, and even more across the whole of Europe. The new livre (known as the livre métrique) was defined as five hundred grams, and the new toise (toise métrique) was defined as two metres. Products could be sold in shops under the old names and with the old relationships to one another, but with slightly different absolute sizes. This series of measurements was called mesures usuelles.

Napoleon's decree was revoked during the reign of Louis Philippe by the loi du 4 juillet 1837 (law of 4 July 1837). This took effect on 1 January 1840, and reinstated the original metric system, thus bringing the system of ordinary measures to an end.

The permitted units

The law authorised the following units of measure:

• The toise (fathom) was defined as two metres and was divided into 6 pieds, or "feet" and 72 pouces (inches). The pouce was divided into 12 lignes, or (lines). The pied and pouce, at 333.3 mm and 27.88 mm were about 2.6% larger than the previous Parisian measures and 9% larger than their British counterparts.

• The aune (ell), used to measure cloth, was defined as 120 centimetres, and divided into the demi aune (half an ell) and the tiers aune (third of an ell). It was 1.3% larger than l’aune de Paris (118.48 cm) and 5.0% larger than its English counterpart (45 inches; 114.3 cm).

• The litre was subdivided like an English quart, into demis (literally, "halves", being the equivalent of a pint of about sixteen fluid ounces), quarts (literally, "fourths", being the equivalent of a cup of about eight fluid ounces), huitièmes (literally, "eighths") and seizièmes (literally, "sixteenths", of about two fluid ounces).

• The boisseau, (bushel), was redefined as being an eighth of a hectolitre and with associated measures double-boisseau, demi-boisseau and quart-boisseau (double, half and quarter bushels respectively). The original boisseau, like the English bushel, varied depending on the commodity for which it was used and the region where is was used.

• The livre, (pound), was defined as 500 grams, divided into 16 onces, (ounces), each once being divided into 8 gros. Each gros being thought of as being composed of 72 grains, whose name is the same as in English. Hence, the livre was 9216 grains. The livre and once were about 10% larger than their English counterparts, while the grain was 17% less than its English counterpart.

The ordinary measures did not include any units of length greater than the toise - the myriamètre (10 km) remaining in use throughout this period.

See also

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• French units of measurement
• History of measurement
• History of the metric system
• International System of Units

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• List of unusual units of measurement
• Metric system
• Systems of measurement
• Units of measurement

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References

1. ^ Alder, Ken (2002). The Measure of all Things - The Seven-Year-Odyssey that Transformed the World. London: Abacus. ISBN 0-349-11507-9.
2. Napoleon I (19 December 1809). "Letter to Général Clarke, duc de Feltre". Correspondance de Napoléon Ier: publiée par ordre de l'empereur Napoléon III. Retrieved 2011-02-10. Je me moque des divisions décimales
3. ^ Denis Février. "Un historique du mètre" (in French). Ministère de l'Economie, des Finances et de l'Industrie. Retrieved 2011-03-10.
4. For example the engineering textbook, Stéphane Flachat (1835). Traité élémentaire de méchanique industrielle. Paris. Retrieved 2011-02-17.
5. Hallock, William; Wade, Herbert T (1906). "Outlines of the evolution of weights and measures and the metric system". London: The Macmillan Company. pp. 66–69.
6. Thierry Sabot (1 October 2000). "Les poids et mesures sous l'Ancien Régime" (in French). histoire-genealogie. Retrieved 2011-02-10. {{cite web}}: Unknown parameter |trans_title= ignored (|trans-title= suggested) (help)
7. ^ Wolfgang Appell (2002). "Königreich Frankreich". Amtliche Maßeinheiten in Europa 1842 (in German). Retrieved 2011-02-10Website based on Alte Meß und Währungssysteme aus dem deutschen Sprachgebiet ISBN 3-7686-1036-5 {{cite web}}: Italic or bold markup not allowed in: |work= (help); Unknown parameter |trans_title= ignored (|trans-title= suggested) (help)CS1 maint: postscript (link)

• Systems of units
• Science and technology in France