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By Joshua Pelleg, G. M. Lindberg

THERE are three reported investigations of self-diffusion in niobium. Lundy et al.1 found their self-diffusion data well represented by the equation

Jan 1, 1970

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Jan 1, 1938

By M. Weinstein, J. F. Elliott

IN conjunction with a study on the solubility of hydrogen in liquid pure iron and iron alloys, new and

Jan 1, 1963

Jan 1, 1954

Jan 1, 1952

Map

Jan 1, 1944

Preliminary plans of this meeting, together with a most interesting series of papers that have been received or promised, were published in the May Bulletin. The plans are being carried out enthusiastically and hospitably by the Colorado members and all indications point to an interesting and valuable meeting.

Jan 6, 1918

By Oleg N. Tikhonov

Control of ball mill grinding circuits is important due to the enormous consumption of electrical energy in mineral processing and other industries. Optimal control requires preliminary detailed studies of static and dynamic characteristics of the process. In this paper a study of nonlinear dynamics is presented with a view toward application to automatic control and the achievement of maximum grinding rate at minimal energy consumption. The study begins with Zagustin's equation (1935) of grinding kinetics [ ]

Jan 1, 1984

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 ROBERY W HUNT 1883 JAMES C, BAYLES 1884-1885 ROBERT H RICHARDS 1886 THOMAS EGLESTON 1887 WILLIAM B POTTER 1888 RICHARD PEARCE 1889 ADAM S HEWITT 1890

Jan 1, 1923

Most of the production of germanium in the U. S. is from byproducts of smelting Tri-state zinc ore. Only in England has commercial manufacture been reported from coal.

Jan 1, 1953

Organization Place Date 1915 American Institute of Architects Washington, D. C. April American Iron and Steel Institute New York, N. Y. May American Society for Testing Materials Atlantic City. N. J. June 25-28 New York Electrical Society New York, N. Y. June National Association of Stationary Engineers Cincinnati, 0. Sept. 9-13 National Exposition of Chemical Industries New York, N. Y. Sept. 23-28 American Chemical Society Cleveland, 0. Sept. National Petroleum Association Atlantic City, N. J. Sept.

Jan 3, 1918

By Olaf Hondrum

CHURN drilling equipment at Bagdad consists of two Bucyrus Erie 27-T model drills and one 22-T drill with gasoline engines. The drilling tools weigh approximately 1600 lb. The holes are drilled with 7-in. bits which are heated in an oil burning furnace and sharpened in an electrically powered bit sharpener. A service truck brings the bits to the drills and takes the dull bits back to the shop. The bits weigh around 250 lb. when new and are handled by drill crews without any mechanical handling device.

Jan 10, 1950

By Persifor Frazer

From the easternmost point reached by the Ural excursion of the VIIth International Geological Congress (the city of Tschéliabinsk, a little more than 30' of longitude east of St.

Jan 1, 1899

By A. J. Shaler, B. F. Oliver

Jan 1, 1961

By Louis C. McCabe

The control of dusts and fumes of submicron size is involved in many process industries. This paper presents in tabular form the quantitative data from a number of metallurgical operations and discusses allowable discharge in terms of effluent-weight ratio. Typical installations for recovery of stack effluents are cited.

Jan 9, 1950

University of Alabama University, Alabama Mining and Metallurgical Society Meets first and third Mondays each month JOHN MACLEOD MCKEE, President WILLIAM L. ALLMAN, Secretary J. R. CUDWORTH, Faculty Sponsor RICHARD L. BOWRON, Counselor University of Arizona Tucson, Arizona Millers' Society LA MONT WEST, President AL WALLACH, Secretary J. B. CUNNINGHAM, Faculty Sponsor B. R. HATCHES, Counselor

Jan 1, 1939

By John R. Lotz

A team of American experts is tackling a whole nations's problems, under the banner of a seven-year plan evolved by the Iranians themselves.

Jan 7, 1950

THE Institute conducts jointly with the American Society of Civil Engineers, American Society of Mechanical Engineers and American Institute of Electrical Engineers, certain activities as listed below, and is joint owner with them of certain properties situated at 29 W. 39th St. in New York.

Jan 1, 1946

STANDING COMMITTEES Executive CHARLES F. RAND, Chairman. JAMES F. KEMP, JOSEPH W. RICHARDS, ALBERT R. LEDOUX, BENJAMIN B. THAYER. Membership BENJAMIN B. THAYER, Chairman. KARL EILERS, JOHN H. JANEWAY, Jr., JOHN D. IRVING, HERMAN A. PROSSER. Finance EDWARD L. YOUNG, Chairman. KARL EILERS, JAMES GAYLEY. Library JAMES F. KEMP, Chairman.1 JOHN HAYS HAMMOND,3 E. GYBBON SPILSBURY,2 ALEX. C. HUMPHREYS,4 BRADLEY STOUGHTON.

Jan 1, 1914

By M. B. Bever, J. E. Reynolds

IN several alloys of iron, copper, and lithium as well as in some pure metals, martensite formed on cooling reverts to the parent phase upon heating to a temperature below the equilibrium temperature at which the parent phase becomes stable.' These martensitic transformations, therefore, are thermally reversible, although appreciable hysteresis may be involved. The martensitic reaction has long been

Jan 1, 1953