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Exact experiments, made by LEFEVRE-GINEAU, with instruments constructed by FORTIN, shewed the weight of the cubic decimetre of distilled water, at the point of the greatest condensation to be 18827.15 grains of the pile of 50 marcs, which is preserved here in the Hotel de la Monnaie, and is called Le poids de Charlemagne; the toise being supposed at 13 degrees of the thermometer of 80 degrees.
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