2023/03/05

Metric law

I found the law which established the metric time system.  


Decree on Weights and Measures
Of 18 germinal year 3 (April 7, 1795)

Article 5.


The new measures will henceforth be distinguished by the name Republican; their nomenclature is definitively adopted as follows:

They will be called:  

Meter, the measure of length equal to the ten millionth part of the arc of the terrestrial meridian between the north pole and the equator. 

Are, the measure of area, for land, equal to a square of ten meters side. 


Stere, the measure intended particularly for firewood, and which will be equal to the cubic meter. 


Liter, the capacity measurement, both for liquids and dry matter, whose capacity will be that of the cube of the tenth part of the meter. 


Gram, the absolute weight of a volume of pure water equal to the cube of the hundredth part of the meter, and the temperature of the melting ice. 


Finally, the unit of time will take the name of jour, equal to the duration of a day from one mean midnight to the next.


Article 7.


The tenth part of the jour will be called decijour and its hundredth part centijour. Its thousandth part will be called millijour


A measurement equal to ten jours will be called a decajour: which provides a very convenient measurement for dividing the year.


However, when we want to express the tenths or hundredths or thousandths of the jour, the unit of time, we may use the words decimal hourdecime, and decimal minute, already received under previous decrees.



Or rather, I wish this is what the law said. What it actually said was: 


Article 22. 


The disposition of the law of 4 Frimaire, year II; which renders  obligatory the usage of the decimal division of the day (jour) and of its parts, is suspended indefinitely.


L 'an deux cent trente un de la République française une et indivisible le second quartidi le jour quatorze du mois de Ventôse à six heures quarante quatre minutes cinquante secondes décimales du t.m.P.






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