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Jan 1, 1940

E. O?C. Acker Jinzoc Adachi Truman H. Aldrich Walter H. Aldridge Anson W. Allen John H. Allen William R. Appleby W. Lawrence Austin W. S. Ayres David Baker John Henry Banks Henry C. Banon Alonzo F. Bardwell Walter A. Barrows H.C. Bellinger Wm de L. Benedict Robert Bentley John F. Berry Andrew A Blair George D. Blood Charles A. Bohn Walter M. Brodie Elwin F. Brown Fredrick Burbidge H.H. Burden Charles Butters

Jan 1, 1943

By R. Roberge, H. Herman

Jan 1, 1969

By Ernest L. Bohnet

Jan 1, 1985

Jan 1, 1943

By James T. Curry

FACED with processing an increasing volume of raw material through its existing plant, early in 1955 Calaveras Cement Co. of California considered incorporating liquid cyclones in its raw mill grinding circuits. One of many problems was the prospect of handling larger volumes of finished slurry through existing pipelines. Fixed capacities of the mechanical classifiers also placed limits on plant expansion.

Jan 10, 1957

Jan 1, 1896

Jan 1, 1923

EXECUTIVE COMMITTEE OF THE BOARD OF DIRECTORS L E Young. Chairman -. Donald H McLaughlan, Vice-Chairman A B Kinzel Earle E Schumacher John R Suman FINANCE COMMITTEE OF THE BOARD OF DIRECTORS Erle V Daveler, chairrnan Phillip Kraft Clyde E Weed

Jan 1, 1949

Executive JOHN R. SUMAN, Chairman PAUL D. MERICA, Vice-Chairman CHESTER A. FULTON W. M. PEIRCE H. Y. WALKER Finance H. T. HAMIL'T'ON, Chairman ERLE V. DAVELER HENRY KRUMB Admissions FELIX E. WORMSER, Chairman GEORGE D. BARRON, Vice-Chairman PHILIP KRAFT EDWARD MEAGHER CLYDE E. WILLIAMS

Jan 1, 1941

Jan 1, 1914

EXECUTIVE COMMITTEE OF THE BOARD OF DIRECTORS C. H. MATHEWSON. Chairman PAUL D. MERICA, Vice-Chairman CHESTER A. FULTON CARROLL A. GARNER H. Y. WALKER FINANCE COMMITTEE OF THE BOARD OF DIRECTORS ERLE Y. DAVELER, Chairman WILBER JUDSON RUSSELL B. PAUL HENRY KRUMB, Consultant

Jan 1, 1943

1-Iron and Steel JOHN A MATHEWS, Chairman Ralph H SWEETSER Vice-chairman WILLIAM CAMPBELL, Vice-chairman MAX ROESLER, Secretary Iron Ore CHARLES B MURRAY, Chairman R C ALLEN W O HOTCHKISS MAX ROESLER ERNEST F BURCHARD THOMAS T READ DWIGHT E WOODBRIDGE M M DUNCAN WILLIAM KELLY CARL ZAPFFE C T FAIRBAIRN CHARLES F RAND

Jan 1, 1923

By C. W. Washburne

Professor Lane makes an interesting contribution to the study of cholride waters, in saying that calcium chloride waters occur not only in the greenstones of Lake Superior copper mines, but also in the interbedded felsitic conglomerated and…

Jan 1, 1915

By Edward F. Fitzhugh

QUANTITATIVE appraisal of the chances of finding various tonnages and grades of ore clarifies any exploratory development proposal. Ways are discussed of appraising chances in conformance with probability principles, and graphs are suggested to show tonnages, grades and the corresponding judged expectancies.

Jan 1, 1947

Jan 1, 1929

Jan 1, 1947

By John D. Nelson

Jan 1, 1985

Jan 1, 1966

By J. B. Czirr, E. P. Palmer

In an effort to improve coal-mine safety, a spectrum analyzer was used to make a detailed examination of the vibration frequencies produced by tapping a mine roof. We show that spectral analysis can be used to distinguish between "solid" and "drummy" roofs to a degree approaching that of the human ear, but it can reveal little about roof-slab thickness or attachment. We recommend research into the utility of augmenting human hearing in roof testing and into utilizing microseismic emissions to help assess roof integrity.

Jan 1, 1983