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Today, the employment of the modern hammer drill, using hollow steel, with air or water to expel the cuttings from the drill hole, is the rule rather than the exception in practically all rock-drilling operations. There is considerable carelessness in the matter of keeping the hole in the drill steel properly opened. Plugged steels wholly or partially, prevent proper operation of the drill, whereby drilling speed is retarded, water tubes are bent or broken, and time is lost in tink-ering, or, as often happens, the drilling gang is idle while someone makes a trip to the shop after another drill steel or water tube. To relieve this condition, the Ingersoll-Rand Company has developed, as an auxiliary to the Leyner sharpener, a new device-the Leyner shank and bit punch.

Jan 4, 1918

By William L. Payne, Edward E. Ives

A unique feature of Potash Co. of America's A new potash property near Saskatoon, Sask., is the use of semi-dome-shaped buildings for product storage. Four domed structures, timber-framed and corrugated-sheet covered, are being built; each designed to handle 20,000 cu yd. The relatively small capacity units, PCA believes, give flexibility not only in storing different grades and sizes of product, but also in permitting greater ease in shipping products as market demands change. The domed buildings are 150-ft diam, comprised of a 16-ft-high concrete wall base, topped with a metal sheet-covered octagonal timber frame. The dome of each unit is designed to fit very closely the angle of repose of the contained material, which results in the maximum usable volume. The entire roof is flood coated with a bitumin to provide a complete weather seal.

Jan 9, 1959

By D. H. Yardley

ENGINEERS and geologists find the magnetic compass unreliable in many mineral bearing areas because of local magnetic attraction. This is the case in the vicinity of many contact deposits, and particularly true in the Lake Superior district where iron formation is wide spread and causes wide fluctuations of the magnetic needle. One of the most useful instruments for geologic traversing or running grid and claim lines under these conditions is the dial compass which does not depend upon magnetism. Difficulties encountered in the field because of local attraction can be overcome through transit observation of Polaris or the sun, or use of the solar attachment. However, a field party often lacks the equipment or time for work of such accuracy and it is here that the dial compass finds its use.

Jan 3, 1954

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

On Jan. 1, the office of the. National Service Committee was established at 502 McLachlen Building, Washington, D. C. The first work was to review current legislative information; which is being continued and good results are accomplished. Whenever matters of importance appear in the Congressional Record, notice thereof with such documents as are germane are forwarded to the members of the committee for their information and advice. The first formal report of the chairman was on the so-called Smith-Howard bill to secure Federal endowment for the establishment of engineering research. The chairman of the Committee, at the request of the Executive Committee of the Engineering Council, appeared before the Senate Committee on Education and Labor for the purpose of opposing those features of the so-called Kenyon bill which would create a practically permanent commission dominated by the Engineering Corps of the Army over all Federal engineering projects as well as state and municipal projects receiving Federal aid. The greater part of the time has been expended in correspondence and consultation on the matter of the establishment of a Department of Public Works. The results of this work lead to the belief that there is much promise of the establishing of such a department by the 66th Congress Hall members of engineering societies, as well as the societies themselves, will unanimously agree on and support a measure, and in order to secure such unanimous support, it will be advisable to call a conference of engineering societies. .

Jan 4, 1919

For the convenience of members who may be traveling from place to place, the Secretary has compiled a list of libraries or other places in the United States and foreign countries where MINING AND METALLURGY or the Transactions may be consulted. This list will be sent to members if they so request. LIST OF THE MEETINGS OF THE INSTITUTE AND THEIR LOCALITIES FROM ITS ORGANIZATION TO MARCH, 1920 [ ]

Jan 1, 1925

Jan 1, 1902

PRESIDENT. CHARLES F. RAND,1 NEW YORK, N. Y. PAST PRESIDENTS. CHARLES KIRCHHOFF,1 NEW YORK, N. Y. JAMES F. KEMP, 2 NEW YORK, N. Y. FIRST VICE-PRESIDENT. BENJAMIN B. THAYER,1 NEW YORK, N. Y. TREASURER. GEORGE C. STONE,1 NEW YORK, N. Y. SECRETARY EMERITUS. ROSSITER. W. RAYMOND NEW YORK, N. Y. SECRETARY BRADLEY STOUGHTON, NEW YORK, N. Y.

Jan 12, 1913

Jan 1, 1931

By William E. Ford, Edward Salisbury Dana

268. The greater part of the specimens or masses of minerals that occur may be described as aggregations of imperfect crystals. Many specimens whose structure appears to the eye quite homogeneous, and destitute internally of distinct crystallization, can be shown to be composed of crystalline grains. Under the above head, consequently, are included all the remaining varieties of structure among minerals. The individuals composing imperfectly crystallized individuals may be: 1. Columns, or fibers, in which case the structure is columnar or fibrous. 2. Thin lamina, producing a lamellar structure. 3. Grains, constituting a granular structure.

Jan 1, 1922

In preparation for the 119th meeting, New York, Feb. 17 to 20, 1919, the following committees have been appointed: Committee on Arrangements ALLEN H. ROGERS Chairman. NY. S. DICKSON, Secretary. J. E. JOHNSON, JR. F. T. RUBIDGE. P. G. SPILSBURY. H. C. PARMELEE. FOREST RUTHERFORD. Committee on Annual Dinner Committee on Luncheon F. T. RUBIDGE. FOREST RUTHERFORD, Chairman. E. B. STURGIS. E. MALTBY SHIPP Committee on Patriotic Meeting H. C. PARMELEE, Chairman.

Jan 11, 1918

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Jan 1, 1942

Michigan College of Mining and Technology, Houghton, Mich W. O Hotchkiss, President. Copies of the Engineering Research Bulletins of the College of Mining and Metallurgy are sent free upon request to those who ask to be placed on the mailing list. From the complete list

Jan 1, 1933

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