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Jan 1, 1938

Launching Platform - Drift Indicator- Stratascope-are components of Carbide and Carbon Chemicals new Mining Machine No. 3.

Jan 1, 1953

Jan 1, 1939

Jan 1, 1947

Jan 1, 1953

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Jan 1, 1938

Jan 1, 1947

A Report Of Current Activity In The Industry

Jan 5, 1951

Jan 1, 1913

By John W. Langley

The unsatisfactory character of most, if not all, of the processes for the direct determination of alumina in the presence of iron and phosphoric acid, and the sharpness with which both the iron and phosqhoric acid can be determined, have led chemists to rely mainly

Jan 1, 1892

Jan 1, 1965

(Members are urged to send in for this column any notes of interest concerning themselves or their fellow-members.) The following members have registered recently at the Headquarters of the Institute Seeley W. Mudd, Los Angeles, Cal. Charles Janin, San Francisco, Cal. Edgar Rickard, London, England. Donnel F. Hewett, Washington, D. C. L. Maurice Cockerell, Chihuahua, Mexico.

Jan 4, 1913

Jan 1, 1960

By J. L. Carne

Careful sampling is necessary to maintain sulphide-oxide ratio of open-pit and underground ores.

Jan 6, 1951

Jan 1, 1947

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 AIME AIME

Jan 1, 1936