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Jan 1, 1947

Jan 1, 1925

Jan 1, 1949

On June 1, the offices of the Engineering Division of the National Research Council were moved from Washington to the sixteenth floor of the Engineering Societies Building, 29 W. 39th St., New York City.

Jan 7, 1919

By AIME AIME

CHARLES ALLEN GIBBONS has been in the anthracite industry now since 1931, following his earlier experience in the bituminous fields, which dated from boyhood. In fact he was born in a coal-mining district-at Morgantown, W. Va.-starting at an early age working in the neighboring mines-going to the secondary schools there and then to West Virginia University. After graduating in 1923 with a B.S. in mining engineering he was made assistant superintendent of bituminous mines in southern West Virginia. Less than a

Jan 1, 1939

POSITIONS VACANT (Under this heading will he published notes sent to the Secretary of the Institute by members or other persons.) In the course of the next few months, a mechanical engineer, who has specialized in the design and erection of copper-smelting plants, including steel work, power equipment, etc., may be required by a company operating abroad. Man speaking German preferred. No. 23. ENGINEERS AVAILABLE (Under this heading will he published notes sent to the Secretary of the Institute by members or other persons introduced by members.) Member, 31 years of age, married, graduate of Massachusetts Institute of Technology, desires position with malleable iron or steel firm. Nine years' experience as chemist and metallurgist in malleable, gray iron, and steel. No. 123. Member, metallurgist, desires position with company making steel, castings, or tool steel. Has had six years' experience with the electric furnace, making steel castings and tool steel, also heat treatment of same. No. 124.

Jan 9, 1914

By Charles H. Fulton

FOR some time it has been thought that there should be > closer relationship between the members' of the Institute engaged in education in the mining schools, the mining, metallurgical, ceramic, and geological departments of universities, and the members of the Institute actually engaged in the production of mineral products and the operation and direction of works. The American Society of Chemical Engineers and the American Ceramic Society have for some years past devoted especial attention to the educational matters of their respective fields. The Engineering Foundation, representing the great engineering societies of the country, is deeply interested in technical education and maintains a Committee on Educational Research.

Jan 1, 1932

Jan 1, 1942

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Jan 1, 1907

Jan 1, 1901

Jan 1, 1936

Jan 1, 1942

1913. FRANDKA WBONA DAMS Montreal, Canada. 1921. WILLIAM CUTHBERTB LACKETT Sacriston, Durham, England. 1923. GELASIOC AETANI. Rome, Italy. 1929. TAKUMAD AN Tokyo, Japan. 1920. HENRYS TURGISD RINKER. Merion Station, Pa. 1922. FEDERICGIOO LITTI. Torino, Italy. 1906. SIR ROBERTA . HADFIELD. London, England. 1928. JOHNHA YSH AMMON.D. New York, N. Y. 1921. FRANKW ILLIAMH ARBORD London, England. 1917. HERBERTH OOVER. Washington, D. C. 1906. HENRI LECHATELIER. Paris, France. 1900. WALDEMAR LNDGREN Cambridge, Mass. 1879. JOHNM ARKLE .New York, N. Y. 1921. C. MCDERMID London, England. 1913. EZEQUIELO RDONEZ Mexico City, Mexico. 1909. ALEXANDRPEO URCEL Paris, France. 1911. ROBERT H . RICHARDS Cambridge, Mass.

Jan 1, 1929

President Howe : It is not so clear to me that the facts which Dr. Waldo brings forward really argue that the nature of the combination between copper and aluminum differs from that of the combination between copper and zinc or copper and tin. As regards electric conductivity, I suppose that the fact, which he thinks points to a special intimate kind of union between aluminum and copper, is that the line in his Fig. 1 is neither straight nor uniformly curved, but that its curvature varies rapidly, not to say abruptly. But we find just such variation in like curves for the copper-zinc and copper-tin alloys. Thus, a slight addition of zinc or tin to copper causes a change in color wholly out of proportion to the quantity added; and, as we add zinc or tin to copper, the tenacity rises very greatly, only to fall off abruptly with further additions of either of these metals. Dr. Waldo : My curve related only to electrical conductivity. The President : If irregularity in one physical property argues

Jan 1, 1895

Jan 1, 1947

Jan 1, 1950

Joseph W. Richards was elected Vice-president and Director to fill the vacancy caused by the election of Philip N. Moore to the presidency. Benjamin B. Thayer was elected Director to fill the, vacancy caused by the election of Charles W. Goodale as Vice-President and Director. Sidney J. Jennings was elected First Vice-President of the Institute. George C. Stone was elected Treasurer of the Institute. Rossiter W. Raymond was appointed Secretary Emeritus of the Institute. Bradley Stoughton was elected Secretary of the Institute. Burr A. Robinson was appointed Assistant Secretary of the Institute.

Jan 4, 1917

By Alfred L. Beebe

to. A strip of thin platinum foil, about one inch square, is perforated with pin-holes over its entire surface. It is then bent into the shape of a letter U, and its opposite corners are connected by short pieces of platinum wire, so as to form a sort of basket. In this is placed a piece of amalgamated zinc of convenient size, and the whole is suspended by a stout platinum or silver wire in the bottle containing the solution to be reduced. Another strip of platinum foil,

Jan 1, 1886

By Robert F. Brindisi

There are approximately thirty to forty operating mills in the United States which are currently producing uranium yellow cake. This figure includes a significant number of in situ and by-product operations however the conventional acid leach flowsheet depicted in Figure 1 is the most common process used by domes- tic yellow cake producers. Ground ore is leached with sulphuric acid and the solids are separated from the pregnant liquor and washed in a series of counter- current decantation thickeners. After clarification of the pregnant liquor, uranium is recovered from the solvent extraction/stripping circuit by the addition of ammonia with precipitation of ammonium diuranate, or simply yellow cake. The yellow cake precipitate is then thickened in a conventional thickener before re- porting to the dewatering/washing unit operation. De- watered solids subsequently report to thermal drying, and clarified liquor from the dewatering/washing step is recycled to the yellow cake thickener. The yellow cake dewatering/washing unit operation is generally accomplished using either a solid bowl centrifuge or a rotary vacuum drum filter. In most cases the underflow from the yellow cake thickener is pumped to the dewatering/washing unit operation at approximately fifteen to twenty percent solids. For the purpose of this discussion ammonium diuranate, the product of ammonia precipitation from a conventional acid-leach uranium mill flow sheet, as discussed earlier, will be considered. With only slight adjustment this discussion will be equally applicable to sodium diuranate or uranium perioxide precipitates and to either in situ or by-product operations where such precipitates are generated. Some of the domestic uranium mills which have selected solid bowl centrifuges instead of vacuum drum filters for the dewatering/washing unit operations are listed in Figure 2. Why have these uranium mills, as well as others not listed, chosen to use the solid bowl centrifuge for this particular application? It is simply a matter of performance, reliability and economics. In the remainder of this paper the performance, initial cost, installation cost, maintenance and power consumption of both the solid bowl centrifuge and the rotary vacuum drum filter will be com- pared. In order to provide a consistent basis for comparison the appropriate sized (centrifuge or filter) unit for the dewatering/washing of 400 to 500 pounds per hour of yellow cake solids will be considered. Such a flow will usually be generated by a typical 3,000 ton per day (acid-leach) uranium mill.

Jan 1, 1980

A letter from Mr. E. F. Cykler, Secretary-Treasurer, informs us that the Engineering Societies Club of Hawaii has been established, and that a member of any one of the following organizations is eligible for membership in the Hawaiian club: American Society of Civil Engineers, American Society of Mechanical Engineers, American Institute of Mining Engineers, American Institute of Electrical Engineers, American Society of Naval Engineers, American Railway Engineering Association, American Society for Testing Materials. The main purpose of this club is the entertainment of visitors from the various national organizations above mentioned, and the Secretary will be glad to hear from any one who is making a trip to the Hawaiian Islands. Mr. Cykler's address is 2A Pantheon Building, Honolulu, Hawaii.

Jan 12, 1917