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Scientific American, Vol. 44, No. 22 (May 1881) (1881)

leaf 4

An illustration from Scientific American, Vol. 44, No. 22 (May 1881), 1881, leaf 4
Litharge 2 " contents dexterously poured into the iron mould, where it A finer balance, sensitive to one-tenth milligramme, with Bicarbonate of soda 1 " quickly chills, and the lead button is removed and cleaned by a weight of one gramme on each pan, with box of weights. Argol 2}4 grammes.… … that the whole of the ore or rock to be the button solidifies (" freezes ").* tested be reduced to a uniformly fine Gold is nearly always found associ- ated in ores with silver, and the button powder or flour and separated from or bead obtained from an assay usually metallic scales or particles, if…

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