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Jan 1, 1950

The airplane, while not a product of the war, owes its present very prominent place to the war; if it had not been for the war its development would have been retarded many years. War planes were made for various purposes, but their most important use was for photographing the enemies' lines. The same methods; with some modifications, are now

Jan 6, 1919

Jan 1, 1946

By Emanuel Trotz

As the long-felt need of a reliable and easily-managed pyrometer has now been fully supplied, by the latest form of Professor Wiborgh's pyrometer, an account of this instrument will, per-

Jan 1, 1893

By R. W. Raymond

Jan 1, 1902

By F. M. Walters

IN order to isolate the effect of an element on some property of an alloy, the effect of the other alloying elements must be elimi- [ ] nated, either by reducing their quantity to the extent that they may be neglected or by determining the specific effect of each. The success of Grossmann1 in calculating [ ] hardenability from chemical composition by means of factors suggested such a

Jan 1, 1942

By F. Z. Schellenberg

A recent visit with the engineering students of the Western University of Pennsylvania to the Keeling coal-mine on the south side of Pittsburgh furnished interesting matter to communicate, as may be the case, however, with regard to the striking features of any of our well-arranged larger collieries; for every mine surely appears unique as a whole, though description fails to give that impression, except in particulars.

Jan 1, 1900

By E. H. Dix

Jan 1, 1940

By M. I. Nathan, K. Weiser, R. S. Levitt, G. Burns, J. Woodall

Jan 1, 1964

By William A. Prichard

After a study of the excellent geological reports and maps prepared by the United States Geological Survey,? and after practical experience in working the ore-deposits in this field,

Jan 1, 1904

Jan 1, 1946

By C. W. Washburne

Professor Lane makes an interesting contribution to the study of cholride waters, in saying that calcium chloride waters occur not only in the greenstones of Lake Superior copper mines, but also in the interbedded felsitic conglomerated and…

Jan 1, 1915

By Christopher C. Barton

Each variable known to affect laboratory measurement of fracture-energy and fracture-toughness is reviewed. Specific examples are cited where each of the variables have been isolated.

Jan 1, 1982

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

Jan 1, 1903

By Oswald J. Heinrich

AT the Baltimore meeting of the Institute in February, 1879, Mr. Eckley B. Coxe, then president of the Institute, called attention in his address to the subject of Secondary Technical Education, and

Jan 1, 1881

Jan 1, 1931

By Oswald J. Heinrich

At the Baltimore meeting of the Institute in February, 1879, Mr. Eckley B. Coxe, then president of the Institute, called attention in his address to the subject of Secondary Technical Education, and

Jan 1, 1881

By Felix A. Vogel

Flue-dust, to most blast-furnace operators, means a troublesome by-product, the formation of which should be curtailed, if not prevented entirely. However, with the increasing use of fine ores, larger furnaces, and high-pressure blast, the production of flue-dust is constantly increasing, and amounts annually in the United States to from 3,000,000 to 3,500,000 tons, an exceedingly high tonnage, of which a large part has been discarded as valueless.

Jan 1, 1913

By F. P. Dewey

THE Falling Cliff Mine adjoins on the west the Bertha Mine, from which a large amount of first-class ore has been taken, producing the purest zinc known to commerce. The two mines are in the same hill, Bertha being on the northern 'slope and Falling Cliff on the top and opposite slope. The formation is No. 2 limestone. Although considerable exploration has been done by numerous shafts and' tunnels (there being over six hundred feet of the latter), no satisfactory determination of the dip and strike of the .vein could be made on account of its contortions, the ore descending from the top to the. bottom of the tunnels and rising again in very short distances; but enough has been done to indicate a very large mass of

Jan 1, 1882