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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, Chairman1 JOHN HAYS HAMMOND,3 E. GYBBON SPILSBURY,2 ALEX. C. HUMPHREYS.4 BRADLEY STOUGHTON.

Jan 10, 1913

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

Jan 1, 1940

By A. W. Cochardt

MOST of the current high temperature materials are precipitation-hardened alloys. These alloys are usually soft when quenched from a solution heat-treatment temperature, but become harder

Jan 1, 1958

Jan 1, 1938

By B. H. Bergstrom

In reading this article, it was difficult to follow through the example given as a starting point in the derivation of the theoretical equation which relates ball size to feed size. A discussion with F. C. Bond led to the following clarification: Bond postulates that "the breaking force exerted by a ball varies . . . as the cube of its diameter . . ." and that the force in pounds per square inch required to break a particle varies . . . as its diameter squared."

Jan 5, 1959

Jan 1, 1943

By T. F. Witherbee

THE following calculation of heat requirement covers the working of the furnace from January 25th to February 14th, inclusive. A short time previous to the first date the furnace had been working rather badly, so that 300 lbs. of ore and 500 lbs. of limestone were taken off. Within the time mentioned the quality of the iron passed

Jan 1, 1877

By Clarence R. King

Diamond drilling of Cove Creek deposits and development of flotation-refining process may lead to commercial operation of property worked sporadically for almost a hundred years.

Jan 4, 1953

By Joseph W. Siefke

Jan 1, 1985

Jan 1, 1918

By William E. Ford, Edward Salisbury Dana

The aluminate, ferrates, etc., allied chemically to the borates, have been already intro- duced among the oxides. They include the species of the Spinel Group, pp. 418-423, also Chrysoberyl, p. 423, etc. SUSSEXITE. In fibrous seams or veins. H. = 3. G. = 3.42. Luster silky to pearly. Color white with a tinge of pink or yellow. Translucent. Index, 1.59.

Jan 1, 1922

By A. E. Hall

The paper gives a general solution of ventilation net- works where densities play an important role and fans operating at different densities from branch densities are considered. Both the physics and computing techniques needed to deal with these networks are discussed.

Jan 1, 1977

Jan 1, 1946

Jan 1, 1940

Jan 1, 1903

By J. Birkinbine

Extended discussions, by inviting attention to problems affecting the conservation of natural resources, have encouraged investigations as to their sufficiency, with the general result that the more thorough the examination, the less cause appears for anxiety as to the exhaustion or serious depletion of these resources.

Jan 1, 1915

Jan 1, 1943

By F. du Breuil, R. L. Mundell

Longwall methods to mine coal in the United States provide the potential advantages of greatly increased productivity, improved safety, and a higher percent recovery. However, use of longwall systems during the past 10 years has increased much more slowly than was anticipated. This paper discusses some of the problems inhibiting the increased use of longwall systems and a proposed research program to address one of the most critical problem areas.

Jan 1, 1981

By C. W. Spencer, K. A. Semlak, F. N. Rhines

IN an effort to obtain a better understanding of sintering in the presence of a liquid phase, it was decided to study the rate of capillary rise of a relatively low melting liquid metal in a higher melting metal powder compact. By assuming that the metal powder compact consists of a great number of parallel capillary tubes and that the flow of liquid

Jan 1, 1958