In France, 16ᵗʰ – 19ᵗʰ century, a unit of mass, about 3.8242264 grams. Also called a drachme, and in Burgundy, a treiseau. According to Guilhiermoz, before the 16ᵗʰ century the same unit was called a tresel in the North and a ternal in the Midi.
By law between 1800 and 1812, 10 grams.
In the Système Usuel, the gros usuelle was about 3.906 grams, 1/128th of a livre usuelle.
Remarques diverses sur les poids et mesures du moyen age.
Bibliothèque de l'Ecole des Chartres, volume 80 (1919).
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Last revised: 16 July 2001.