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By Herbert A. Stein, John B. Murdock

Perlite is a natural volcanic glass which expands into an insulation material upon the application of heat. This paper discusses the operating characteristics of eight different types of furnaces for the expansion of perlite. It also includes a section on the theory of perlite expansion which serves as the basis for the authors' analysis of the furnaces.

Jan 1, 1950

By Sam F. Harrison

The National Board of Boiler and Pressure Vessel Inspectors again sends out this recommendation: If you have an air compressor that is mounted directly on the air tank, get it off. Characteristically, small- to intermediate-sized air receivers are thin-walled vessels, and as such are prone to failure when subjected to external loading. Many of these vessels, if not a great majority, are bought by a distributor of air compressor systems, who provides the compressor, motor, switchgear and other accoutrements-all of which are very frequently mounted on a base which is then welded to the shell of the receiver. These welds at the points of attachment transmit external loading to the tank in the form of weight and vibration, frequently resulting in stress-induced cracks.

Jan 3, 1978

By R. B. Berg

Chlorite veins in the Silver Star district were of little interest to those who were mining gold and silver in the late 19th century. In 1975 unusually pure magnesian chlorite of the variety clinochlore was identified from a "talc" claim in this district. In 1977 tests by Cyprus Industrial Minerals showed that this chlorite was suitable for use in ceramics. Mining begun in that year continues. These replacement veins of chlorite in Precambrian quartzofeldspathic gneiss differ from nearby metalliferous veins to the northwest in both attitude and mineralogy.

Jan 1, 1984

Alan Stanley (Titanium Dioxide Analysis of Maclntyre Ore by Specific Gravity, P. 971) is currently head of the General Metallurgical Group of the National Lead Co. He has been with National Lead since 1946, after serving with the USAAF as a first lieutenant of engineers during World War II. A native New Yorker, he graduated from Virginia Polytechnic Institute in 1942 with a Bachelor of Science in Chemical Engineering. Since joining National Lead he has been a flotation supervisor, in the high tension pilot plant, and done sinter testing. He is an AIME member and presented one other paper before the Institute, Sintering Characteristics of Minus 65 and 20 Mesh Magnetite. Stanley plays the piano in his leisure moments.

Jan 1, 1952

By Persifor Frazer

AMONG the geological problems with which the present Pennsylvania Geological Survey has had to deal is the relative age of a series of strata passing around and through the city of Philadelphia, Bucks, Chester, and Delaware counties. Rogers includes all these rocks in his hypozoic series, and every student, so far as the writer knows, with one exception, has assigned to them a position beneath the Potsdam sandstone, or " Primal " of that eminent and gifted geologist. So far as regards the small portions of this belt, to which it is the intention of the present paper to draw attention, even the one geolo - * Read at the Lake Superior Meeting, August, 1880.

Jan 1, 1881

C. M. GARLAND,§ Chicago, Ill. (written discussion 11).-7--In the development of Mr. Traer's method for the low-temperature coking of Illinois coals, after the principles laid clown by Prof. Parr, it was soon demon-strated that, in order to yield a product of uniform volatile content, the coal must be coked in thin layers, and consequently must be handled in comparatively small volumes. This means, in the first place, that great care must he observed in the design of the coking chambers to prevent the loss of the products of distillation, and, in the-second place, that labor-saving devices must be utilized to the greatest possible extent in order to reduce the cost of handling.

Jan 12, 1918

EXECUTIVE COMMITTEES OF LOCAL SECTIONS New York, L. W. FRANCIS, Chairman, WILLARD S. MORSE, Vice-Chairman. THOMAS T. READ, Secretary, Woolworth Bldg., New York, N. Y. P. A. MOSMAN, Treasurer. LOUIS D. HUNTOON. WILLIAM A. POMEROY. Boston HENRY L. SMYTH, Chairman. ALFRED C. LANE, Vice-Chairman. AUGUSTUS H. EUSTIS, Secretary-Treasurer, 131 State St., Boston, Mass. ROBERT H. RICHARDS, ALBERT SAUVEUR. Columbia FRANK A. ROSS Chairman. RUSH J: WHITE, Vice-Chairman. LYNDON K. ARMSTRONG, Secretary-Treasurer, P. O. Drawer 2154, Spokane, Wash. FREDERIC KEFFER FRANCIS A. THOMSON,

Jan 2, 1915

Jan 1, 1965

A development which could prove significant was the announcement on September 18 by Lone Star Industries, Inc., Greenwich, Conn., that the Snyder process which utilizes shock phenomena to break down ore in seconds, is operational. J. R. Kringel, chairman and president of Lone Star, says this about the process: "This new approach to the comminution of ores not only provides better mineral liberation at lower capital and operating costs, but it also makes a significant contribution toward the more efficient utilization of the country's rapidly depleting mineral reserves." The Snyder process consists of loading the material into a chamber, introducing a compressible working fluid such as steam under 300-500 psi, or as low as 80 psi, and then opening a millisecond-action discharge valve, causing the material to become entrained in the expanding fluid. The mixed fluid moves through a duct toward a discharge zone at near-sonic velocity, and is subject to a variety of extreme shock phenomena which accomplish the desired size reduction and mineral liberation.

Jan 11, 1972

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Jan 1, 1938

Jan 1, 1921

By M. K. McCarter

Jan 1, 1985

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Jan 1, 1938

By Howard B. Gundersen

CURRENTLY the mining industry faces the twin tasks of producing metals in the largest possible amounts and doing it with a dwindling and less experienced labor supply. A manpower shortage during this emergency appears inescapable. It therefore becomes necessary to develop the highest possible efficiency. Employee training is a concomitant of economical, high production. Training keeps employee morale high, reduces waste, improves skills, and increases production without speed-up or overload of workmen or supervisors.

Jan 9, 1951

By T. W. Doe, J. Noorishad

The problem of fluid flow from a well into a horizontal fracture has been studied using a nonlinear coupled hydromechanical finite element model. Such an approach is required due to the strong nonlinearity and anisotropy of deformation and fluid flow moduli introduced by the presence of the fracture. The resulting nonuniform total stress field invalidates the application of the conventional fluid flow techniques to the problem. Stable convergent solution from the above analysis are verified by a coupled steady state algorithm.

Jan 1, 1982

By Bailey, Lewis Newton

Bailey, Lewis Newton, Master Engineer, Senior Oracle, 4th Regiment, U. S. Engineers, Headquarters Company, died of pneumonia, at Camp Merritt, N. J., on April 30, 1918. Baird, Louis, Lieut., Royal Field Artillery, British Army, died on the battlefield in 1915. Ballamy, John H., Capt., 103d Engineers, killed in action near Fismes, Aug. 9, 1918. Burt, Andrew, died in active service, 1916. Cobeldick, William Morley, Royal Engineers, died from gas poisoning on October 7, 1915. Dougall, Ralph, 4th University Co., Princess Patricia Regiment, killed in action early in the war. Evans, Alfred Winter, Lieut.-Col., New Zealand Rifle Brigade, D. S. 0., D. C. M. killed in action on October 12, 1917. Gorman, Thomas C., Lieut., Canadian Engineers, killed in France, Mar. 18, 1918. Hague, William, 1st Lieut., Engineer Officers' Reserve Corps, died in active service, Jan. 1,, 1918. Hall, William T., Capt., Royal Flying Corps, killed in action, May 19, 1917.

Jan 11, 1918

By Richard Klimpel

In this paper various formulae are developed which can be used to estimate stream flow rates or weight ratios given information on the stream components. The type and level of experimental error present in the stream component analyses does have an important bearing on the numerical values (and reliability) of the weight ratios calculated by the various formulae. A simple but theoretically sound method is shown for selecting appropriate estimation formulae for any given engineering operation. The derived formulae are applied to sets of experimental classification data for illustration purposes.

Jan 1, 1980

By R. A. Wyman

The overall approach to nonmetallic mineral flotation practiced in the laboratories of the Mines Branch, Ottawa, Canada, is outlined. The use of floatability tests to indicate possible areas of selectivity is indicated. Selected examples of the evolution of flotation systems are presented. Reagents are briefly discussed.

Jan 1, 1972

By N. S. Parate

Detailed analysis is given of the influence of water on the strength of limestone. The mechanism involved in strength reduction is described. Such analysis is of importance in geological, civil, constructional, mining, and metallurgical engineering and is closely associated with the rock mechanics involved in these areas. Mine dumping, slope stability, excavations, sedimentation, etc., are very much affected by the presence of water. Tensile stresses, which have an important role in the development and propagation of fissures, are produced by water in cracks. The development of fissures can be responsible over a long period of time for an ultimate, catastrophic failure.

Jan 1, 1974

By Gary A. Kordosky

Winning copper from oxide ores usually involves hydrometallurgical techniques. The processes involved are the leaching of copper from the ore and the recovery of the leached copper from the aqueous solution.

Jan 1, 1981