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By Elliott J. Roberts

The theory is developed that the tons ground through a given mesh per day in a wet ball mill is proportional to the percent plus that mesh in contact with the balls and the net power applied to the balls at this point. A grindability test is described.

Jan 12, 1950

By Dorsey Hager

One of the most interesting fields in North America was discovered, early in 1922, near the towns of Sunburst and Kevin, Toole County, Mont. This field produces oil from the Jurassic beds, which heretofore have been of but little importance as oil producers, and promses to be the

Jan 1, 1923

By Dorsey Hager

One of the most interesting fields in North America was discovered, early in 1922, near the towns of Sunburst and Kevin, Toole County, Mont. This field produces oil from the Jurassic beds, which heretofore have been of but little importance as oil producers, and promses to be the

Jan 1, 1923

By D. W. Brunton

The object of the investigations and experiments here recorded was to obtain such information and data as would make it possible to determine the fineness to which crushing must be carried, in sampling gold- and silver-ores, in order to obtain results within an allowable limit of error.

Jan 1, 1896

By AIME AIME

SHORTLY after graduation from Girard College, Francis B. Foley found employment in the open-hearth department of The Midvale Steel Co. later joining its research department. After twelve years with Midvale he became a professor in the department of metallography of the University of Minnesota. With the coming of the World War, he was called upon by the War Materials Investigation Committee to work on the manganese problem. In 1918, he took charge of the iron and steel division of the U. S. Bureau of Mines, at Pittsburgh, and. after a year of co-operative study of carbon steels with the late Henry M. Howe, was assigned to the Bureau's stations at Minne-

Jan 1, 1937

Dr. James Douglas, who is memorialized on another page of this Bulletin, who held a place in the affections and regard of Institute members second to that of no other living roan, left in his will the sum of $100,000 for the maintenance of the Library of the American Institute of Mining Engineers. This is in addition to the $100,000 which Dr. Douglas gave during his lifetime. We believe that it is Dr. Douglas' wish that the library, the great means by which the benefits of Institute membership may be extended to those distant from headquarters, should be maintained by the Institute at the highest possible level of efficiency and serviceability.

Jan 9, 1918

By M. Guney, A. R. Bell

In Mindola mine on the Zambian Copperbelt, there is a plan to extend the current production level of 1.2- 1.5 km (3,900-4,900 ft) with five additional production levels. Research work indicated that the present total heat output of 38.6 MW will inevitably increase to 63.2 MW in 25 years. Estimated WE and DB temperatures, representing the total heat generation in stope faces and development headings during these same periods are predicted to increase to 33.8/40.2°C (93/104°F) and 35.3/42.1°C (95/108°F) respectively. It is assessed that the nominal refrigeration capacity needs to be progressively increased to 9,000 M W.

Jan 1, 1984

THE Council of the Geological Society of America has named its gold medal after R. A. F. Penrose, Jr., who recognized the need of such an award and supplied the endowment. The medal is to be awarded for achievement in pure science and may be given to a worker of any race or nation. Mr. Penrose, whose own professional work has been mainly in applied geology, had previously established a medal fund for the Society of Economic Geologists. This was awarded to T. C. Chamberlin at the meet-ing of that Society at Cornell University in 1924. The new medal is to be given on the recommendation of the G. S. A. Council, but not necessarily every year.

Jan 4, 1927

During the four years that Burr A. Robinson has held the position of Assistant Secretary of the Institute he has not only won the regard and admiration of the Directors and his associates at headquarters because of his unselfish devotion, efficiency and painstaking application, but lie has formed a wide circle of friends among the members of the Institute. All will learn with regret that he has voluntarily severed his connection with the Institute in order to take a position with the United States Rubber Co., which offered such flattering prospects for the future that the Board of Directors, in spite of their disinclination to lose his services, did not feel justified in urging him to decline.

Jan 8, 1917

About 1300 members and guests attended the Seventh Annual Mid-winter Convention of the American Institute of Electrical Engineers, which was held in the Engineering Societies' Building, New York, on Feb. 19 to 21. The opening session was a joint session with the American Institute of Mining Engineers, when welding was discussed. The various phases of standardization in engineering work were discussed by President Comfort A. Adams at the Thursday morning session. Thursday afternoon was spent in visiting. Some of the guests visited the Brooklyn Navy Yards, where they inspected the power plant, shops, dry, docks, etc. ; others visited the Bell System Laboratories of the Western Electric Co. The papers at the various technical sessions provoked considerable

Jan 4, 1919

The Library is a cooperative activity of the American Institute of Mining and Metallurgical Engineers, the American Society of Civil Engineers, the American Institute of Electrical Engineers and the American Society of Mechanical Engineers. It is administered as a public reference library of engineering and the allied sciences. It contains 133,000 volumes and pamphlets, 6700 maps and receives currently most of the important periodicals in its field. In order to place the resources of the Library at the disposal of those unable to visit it in person, the Library is prepared to furnish lists of references to engineering subjects, copies or translations of articles, and similar assistance. Charges sufficient to cover the cost of this work are made.

Jan 1, 1933

The officers of the Missouri Mining Association of the Missouri School of Mines, Rolla, Mo., are L. W. EHLERS, President. J. G. REILLY, Vice-President. W. A. SHAW, Secretary. H. A. KLUGE, Treasurer. Smokers have been held monthly, at which addresses have been given by out-of-town engineers, as well as by faculty members. So far the speakers and topics have been as follows: L. A. Delano, '08, Milling and Flotation in S. E. Mo. W. D. Beeghly, Ex. '16; Coal Mining in Norway. Prof. H. G. Cox, Experiences in the Nome District. Prof. Rice, Kansas Univ., The Manufacture of Portland Cement. Philip N. Moore, The Ethics of the Mining Profession. L. W. EHLERS, President.

Jan 5, 1916

By P. I. Lipman

Largely forgotten by today's environmentalists and mineralogists is a pioneer scientist of the nineteenth century named Ellen Swallow. Fortunately, the memory of her accomplishments has been resurrected by Robert Clarke in his biography, Ellen Swallow: The Woman Who Founded Ecology. Her direct contributions to the field of mining included authoring First Lessons in Minerals and an analysis of the rare mineral samarskite which indicated the presence of an insoluble residue; her findings led to the eventual discovery of samarium and gadolinium. While enjoying the distinction of being the first woman student at the Massachusetts Institute of Technology, she successfully isolated vanadium in an ore which other experts had examined without detecting the metal.

Jan 1, 1974

CLARENCE N. FENNER.-Mr. Gelstharp, chief chemist of the Pitts-burgh Plate Glass Co., has directed my attention to the fact that that company was using optical pyrometers obtained from the Leeds & Northrup Co. several months before the members of the Geophysical Laboratory arrived at Charleroi. I am glad to make this correction. The chief object of my paper was to emphasize the necessity of careful temperature control in the making of optical glass and to describe the kind of tests to which an optical pyrometer should be subjected at a glass plant in order to obtain information regarding the closeness with which its readings correspond with true temperatures under the condi-tions which prevail in each particular case.

Jan 12, 1919

By C. C. Spencer

A CHARGE of 12,200 lb of scrap was used on all heats. The slag materials that were added to the furnace along with manganese ore were kept constant; that is, 230 lb Coxey sand was put on the banks at the slag line before each heat was charged, 35 lb limestone was added after the carbon boil. manganese ore was the only item varied in the four series described herein. I might add here that it is impractical for us to get the carbon clown in one boil, for the steel would come out through the doors and run over the floor. We take the carbon down in two vigorous boils.

Jan 1, 1947

By Richard H. Terhune

Slag and matte, in lead and copper smelting, are, for convenience of removal, tapped into pots of small capacity, usually of paraboloid form, of cast-iron, weighing 275 to 300 pounds, and holding the same weight of slag. As in many smelting districts one ton of ore makes a ton and a quarter of slag, a large number of pots is needed to equip an ordinary plant. Sudden and frequent expansion of the solid bowl causes the pots to crack at the bottom in a few months, and the matte, a very fluid sulpliide, enters these rough fissures and speedily corrodes its way through the vessel. 1 find, from one year of practice with a slag-

Jan 1, 1887

By William R. Hart

I was this morning an interested listener to the remarks of Mr. Ashbel Welch in regard to his designing a new section for steel rails, in 1866; and for the salze of the truth of history, and in order t:, give the credit to an American (and where it rightfully belongs) of higning the first section for steel rails, which was intelligently adapted to that material; I beg to state the following facts: On the 14th of August, 1866, Mr. Ashbel Welch gave me an order for 200 tons of steel rails, to be made bbr the Camden and Amboy Railroad, from a section designed by him. A copy of this section 1 append herewith.

Jan 1, 1881

(Members are urged to send in for this column any notes of interest concerning themselves or their fellow-members.) Members and guests who registered at Institute headquarters during the period Aug. 10 to Sept. 10, 1914: William Huff Wagner, Milford, Del.. Stanley C.- Herold, San Jose, Cal. Charles W. Hamilton, Tampico, Mexico R. J. Grant, Denver, Colo. A. M. Van Rensselaer, New London, Conn. John Lloyd, Wilkes-Barre, Pa. . Henry C. Carr, New York, N. Y. D. M. Riordan has been appointed to act as special adviser to the Secretary of the Treasury and has sailed on the U. S. S. "Tennessee" for Europe, where he will assist in aiding Americans in returning to the United States.

Jan 10, 1914

By L. D. Jaffe, W. P. Clancy, D. C. Buffum

Many earlier workers have suggested that the temper brittleness of steel is associated with the presence of carbon or nitrogen. Nevertheless, no investigations on the effect of removal of these elements upon susceptibility to temper brittleness have been published. It was therefore decided to determine whether temper brittleness would develop in an iron alloy ...__, ing very little carbon and nitrogen. The alloy, in the form of a 10-lb ingot, was prepared by melting purified materials under . argon. Its composition, in per cent, was: This analysis, except for carbon content, is within the specified range for SAE 3140, which has been demonstrated by previous work at this laboratory2 to be markedly susceptible to

Jan 1, 1950

By Edel Moldenke

Burma has long been known for its ruby, tungsten, and tin deposits, and, lately, for having the largest lead-zinc mine in the world, the Bawd-win mine of the Burma Corpn. All the coal used, however, is imported from Calcutta; this is a bituminous coal of about 11,000 B.t.u., 24 per cent. ash, and costs about $8 per ton. Bituminous coal has not, thus far, been found, but many lignite deposits are known. The most promising lignite deposits are in the Namma field, Fig. 1, situated in the Northern Shan States of Upper Burma, about 30 mi. south of Lashio, the terminus of the Burma Railway, 750 mi. north of Rangoon. The

Jan 1, 1922