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Jan 1, 1947

By Herbert Clark Hoover, Lou Henry Hoover

Jan 1, 1950

Jan 1, 1947

Jan 1, 1922

New Products Equipment

Jan 12, 1951

Jan 1, 1918

Jan 1, 1908

Jan 1, 1917

Jan 1, 1924

Jan 1, 1940

Jan 1, 1924

Jan 1, 1923

The technique of hard facing can be a quick and economical means of prolonging wear-life of many metals, but maintenance personnel must first select the proper alloy from the hundred that are available. Even then, roper selection is effective only when it is properly applied by the welder. To complete the successful weld, several hints are offered:

Jan 4, 1978

By S. D. Strauss

Mr. Strauss takes apart the double threat of monopoly and failing resources in this article. Originally presented before the American Electroplaters Society, the basic contents o f his message are a warning that traditional trust-busting and mineral shortage concepts have been outdated by the broadened scope of competition. But to the miner, stoic before the cyclical predictions of feast and famine, traditional markets aren't getting any easier.

Jan 8, 1961

By S. F. Ravitz, S. R. Zimmerely

High-grade cobalt concentrates were produced from the complex Blackbird ore with very good recovery in continuous pilot-plant operations in which a low-grade bulk cobaltite-pyrite flotation concentrate was roasted in a multiple-hearth furnace to oxidize the pyrite selectively. The cobaltite was floated from the resulting calcine.

Jan 10, 1950

By Walter G. Perkins

As this particular product holds a place by itself, it seems desirable to give a paper dealing especially with it as a corollary to my paper entitled " The Litharge Process of Assaying Copper-Bearing Ores and Products, and the Method of Calculating Charges."* The process is first to convert the metallic copper into matte by the addition of sulphur, allowing the two elements to combine at the bottom of the crucible when heat is applied. The

Jan 1, 1903

Jan 1, 1962

By J. F. Mahoney, P. B. Hobsbawn, N. Arbiter, C. C. Harris

Current trends in flotation applications are reviewed and effects of increased cell sizes and automation of circuits considered. The role of laboratory and pilot plant investigations in establishing design criteria and project feasibility are assessed and illustrated.

Jan 1, 1978

By Marling J. Ankeny

MINING research in the U. S. today is indeed complex, whether it involves the Government, a small private concern, or a large one. And it promises to become more so, despite great advances already made in developing equipment and technology. The U. S. Bureau of Mines is committed to place greater emphasis on mining research as expressed in a recent policy statement to Congress on the "Long Range Minerals Program," by Secretary Fred A. Seaton, quoted above.

Jan 1, 1958

By Oswald J. Heinrich

AT the Baltimore meeting of the Institute in February, 1879, Mr. Eckley B. Coxe, then president of the Institute, called attention in his address to the subject of Secondary Technical Education, and

Jan 1, 1881