r proportion, some 55 pounds, was prepared in the and are supposed to be due to the extreme fragility of the laboratory of M. St. Claire Deville. body and its crystalization against the surfaces of the mold. Quite recently the ingot from which the standards are to In order to prevent the splitting,… … lightly pulverulent. When the crown are held in clamps of cop- platinum was melted, in a cavity per fixed in two standards, shown FURNACE FOR MELTING PLATINUM. hollowed in the stone, the car- separately at the left of Fig. 2, bonic acid (due to the heating of the mineral) only became because of the…
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