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Jan 1, 1942

Jan 1, 1910

Jan 1, 1913

Jan 1, 1955

Jan 1, 1885

Jan 1, 1889

Jan 1, 1938

OFFICERS AND DIRECTORS For the year ending February, 1932 PRESIDENT ROBERT E. TALLY JEROME, ARIZ. FREDERICK W. BRADLEY SAN FRANCISCO, CAL. WILLIAM H. BASSETT,P WATERBURY, CONN KARL EILERS NEW YORK N. Y.

Jan 1, 1929

Jan 1, 1946

Jan 1, 1952

Jan 1, 1918

Jan 1, 1910

By T. Egleston

SOME months ago samples of black oxide of copper and of pig copper from Colorado were sent to me to examine for arsenic and

Jan 1, 1882

By Bleeker L. Wheeler

Potential, not past earnings form the basis of valuation. Markets, taxes, transportation and numerous other factors are also of prime importance.

Jan 7, 1951

By Wm. C. Phelps, R. E. Grace

b R.c c)nduciivity of slags and glasses is of particular interest when viewed as an activated ionic flow process. The ionic conductivity, for example, has been found to obey the Easch-

Jan 1, 1958

By T. M. Morris

THE following data have been compiled from in- formation submitted by 24 plants in answer to a questionnaire sent to cyclone manufacturers and to companies using cyclones for wet classification, either for closed circuit grinding or for desliming.

Jan 8, 1957

JESSE L. JONES, ? Pittsburgh, Pa. (written discussion?).-From a commercial standpoint, the most important characteristic of the electric furnace is the ease with which it lends itself to intensive production. The melting of non-ferrous metals, as usually clone in crucible, open-flame, reverberatory, and similar furnaces, has certain disadvantages which are absent in the electric furnace, viz.:

Jan 4, 1919

By U. Runolinna, R. T. Hukki

Preliminary separation of precious metals by flotation can offer a simplification of the conventional method of treatment of anode slimes. Laboratory flotation experiments show that rich gold and silver concentrate can be obtained with excellent recoveries.

Jan 11, 1950

By T. Sterry Hunt

In a paper presented to the Institute in 1881* I have discussed at some length the question of the " Hydrometallurgy of Copper," and among others, have noticed two methods, devised and patented by Mr. James Douglas and myself, for the extraction of copper

Jan 1, 1888