24 83 12 1000 POIDS ET MESURES. Système métrique 55a Extension du système métrique à l'étranger.. 552 Mesures légales de France. 562 Système C.G.S 570 Conversion des anciennes mesures en 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C'est la loi du 19 frimaire an IV (10 décembre 1799) qui a donné une valeur légale aux étalons définitifs du mètre et du kilogramme établis à la suite des travaux de Delambre, Méchain, Laplace, Borda, Lavoisier. Ces étalons furent déposés aux Archives nationales. Enfin la loi du 4 juillet 1887 a rendu le Système métrique obligatoire en France. EXTENSION DU SYSTÈME MÉTRIQUE À L'ÉTRANGER. De bonne heure on