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Jan 1, 1943

By Rikuro Otsuka

TITANIUM is attacked slowly by hydrochloric acid," and corrosion rates decrease with time of exposure.' This behavior is due to the formation

Jan 1, 1958

United Engineering Trustees, Inc. W. D. B. MOTTER, JR., '44 A. L. QUENEAU, '45 ALBERT ROBERTS, '43, President The Engineering Foundation GEORGE D. BARRON, '44 F. F. COLCORD. '46 A. L. QUENEAU, '45, Chairman

Jan 1, 1943

United Engineering Trustees, Inc. W. D. B. HOTTER, JR., '44 A. L. QUENEAU, '45 ALBERT ROBERTS, '43 The Engineering Foundation GEORGE D. BARRON, '44 F. F. COLCORD, '46 A. L. QUENEAU, '45

Jan 1, 1942

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C. 0. FAIRCHILD, Washington, D. C. (written discussion*).-Referring to the paragraph entitled "Effect of change in temperature of absorbing glass on its transmission," Dr. Foote and the writer have been using, since

Jan 11, 1919

[MININQ METHODS WILLIAM J. COULTEB, Chairman PHILIP B. BUCKY, Vice-Chairman LELAND A. WALKER, Vice-chairman ) CLYDE E. WEED. Vice-Chairman CHARLES F. JACKSON, Secretary]

Jan 1, 1946

Jan 1, 1901

Jan 1, 1935

Jan 1, 1893

By William P. Blake

The occurrence of siderite in beds of considerable thickness in the clay formations of Martha's Vineyard, Mass., may have some economical importance, and is at least interesting in a scientific point of view.

Jan 1, 1965

Jan 1, 1942

Jan 1, 1953

Jan 1, 1946

PROGRESS IN DRILLING tungsten-carbide bits, lighter pneumatic drills, bonus plans, and alloy steels are discussed at northwestern gathering.

Jan 3, 1951

Jan 1, 1969