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Jan 1, 1935

Jan 1, 1932

Jan 1, 1882

PRESIDENTS DAVID THOMAS 1871 R W RAYMOND 1872-1874 A L HOLLEY1875 ABRAM S HEWITT 1876 T STERRY HUNT 1877 ECKLEY B COXE 1878 - 1879 WILLIAM P SHINN 1880 WILLIAM METCALF 1881 RICHARD P ROTHWELL 1882 RIVHARD W HUNT 1883

Jan 1, 1910

[United Engineering Trustees, Inc. W. D. B. MOTTER, JR., '40 A. L. QUENEAU, '41 ALBERT ROBERTS, '41 The Engineering Foundation GEORGE D. BARRON, '44 F. F. COLCORD, '42 A. L. QUENEAU, '41 Engineering Societies Library Board J. W. LAIST, '40 A. B. PARSONS, Ex-officio T. T. READ, '42 F. F. SHARPLESS, '41]

Jan 1, 1940

By H. A. Gardner, G. B. Heckel

The principal use of barium sulphate is as an inert paint pigment.

Jan 1, 1915

By William P. Blake

The frequent association of apatite in layers in the midst of magnetic iron-ore is highly significant of a stratified and organic origin of both minerals. Usually the phosphate of lirne is more abundant

Jan 1, 1893

For the convenience of members who may be trawling from place to place, the Secretary has compiled a list of libraries or other places in the United States and foreign countries here MINING AND METALLURGY or the Transactions may he consulted. This list will be sent to members if they so request.

Jan 1, 1923

Jan 1, 1902

Conservation and Survey Division, University of Nebraska, Lincoln, Nebr. G. E Condra, State Geologist. Publications in geology of tlie Conservation and Survey Division are as follows: No 1, Stratigraphy of the Pennsylvanian System in Nebraska, by G. E Condra, 75 cents; 3, Correlation of tlie Pennsyl-

Jan 1, 1933

By Michael R. Wilder

This paper discusses the two major problems of computerization currently confronting the coal mining industry, specifically, user education and standardization of software practices. Each problem has a unique set of criteria that require addressing individually and collectively. This paper addresses these problems and additionally, a plausible method of overcoming these problems.

Jan 1, 1983

The following list contains the names of members of whose deaths notices have been printed in MINING AND METALLURGY during the year ending April 1, 1939. Biographical sketches published in MINING AND METALLURGY are indicated in the last two columns.

Jan 1, 1941

STANDING COMMITTEES Executive-A. R. LEDOUX, chairman. Membership-GEORGE C. STONE, chairman. Finance-J. V. N. DORR, chairman. Library-E. GYBBON SPILSBURY, chairman. Papers and Publications--BRADLEY STOUGHTON, chairman. Nominations-POPE YEATMAN, chairman.

Jan 9, 1919

Jan 1, 1949

United Engineering Trustees, Inc. GEORGE D. BARRON WILLIAM H. BASSETT R. M. ROOSEVELT The Engineering Foundation GEORGE D. BARRON H. C. BELLINGER E. DEGOLYER Engineering Societies Library Board ROBERT PEELE PHILIP W. HENRY H. K. MASTERS A. B. PARSONS, Ex-officio R. H. SWEETSER

Jan 1, 1932

The following figures (Nos. 1-4) and tables (Nos. 1 and 2) were inadvertently omitted from the chapter entitled "Optimum Open-Pit Mine Production Scheduling" by Thys B. Johnson, Section 4, pages 539-562. [ ]

Jan 1, 1969

By John J. Strohl, Henry J. Schwellenbach

This paper relates the results obtained by decreasing the size of feed to a rod mill screen circuit. As would be expected, added production was gained and a finer grind with no tonnage loss was made possible.

Jan 12, 1950