The Transactions of the American Institute of Chemical Engineers


    Two addresses delivered by the president, Dr. F. W. Frerichs, at Chicago and Washington are chiefly devoted to descriptions of six problems in chemical -engineering practice. One of these, the extraction of bismuth from carbonaceous ores, consists of a complete account of the recovery of this metal from ores containing 1 oz. of lead, 15 oz. of silver 5 per cent, lead, and 5 percent, of.bismuth. The metal produced greatly in excess of the consumption, which in 1910 was about. 200,000 lb for the United States. It is used. almost exclusively for, medicinal purposes.

    The Transactions of the American Institute of Chemical Engineers.

    Vol. iv., 1911. Pp. iv + 514. (New York: D. Van Nostrand and Co.; London: E. and F. N. Spon, Ltd., 1912.) Price 30s. net.

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