The French First Republic, in introducing the…
February 1812 CE
The administration had distributed tens of thousands of educational pamphlets, private enterprise produced educational games, guides, almanacs and conversion aids, and meter standards were built into the walls of prominent buildings around Paris.
The introduction had been phased by district over the next few years, with Paris being the first district to change.
The government had also realized that the people would need meter rulers, but they had only provided twenty-five thousand of the five hundred thousand rulers needed in Paris as late as one month after the meter became the sole legal unit of measure.
To compensate, the government had introduced incentives for the mass-production of rulers.
Paris police reported widespread flouting of the requirement for merchants to use only the metric system.
Where the new system was in use, it was abused, with shopkeepers taking the opportunity to round prices up and to give smaller measures.
Emperor Napoleon dislikes the inconvenience of surrendering the high factorability of traditional measures in the name of decimalization, and recognizes the difficulty of getting it accepted by the populace.
Under the décret impérial du 12 février 1812 (imperial decree of 12 February 1812), he introduces a new system of measurement, the mesures usuelles or "customary measures", for use in small retail businesses.
However, all government, legal and similar works still have to use the metric system and the metric system continues to be taught at all levels of education.
The prototypes of the metric unit, the kilogram and the meter, had 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) is defined as five hundred grams, and the new toise (toise métrique) is defined as two meters.
Products can 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 is called mesures usuelles.