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acid amount of gas amount of methane anthracite anticline atmospheric pressure average basin blowers Bureau of Mines carnotite carnotite deposits carried cent carbon dioxide cent methane charge coal beds coal exposed contained cost crucible Crucible Steel Cu.ft cubic feet depth district east electric furnace electrodes electroscope explosions feet a minute feet of air feet of coal feet of methane feet thick ferrosilicon figs figure Fire Damp gangway gaseous gases gram hearth heat Hillman holes inches induction furnace kilowatt-hours low-grade magnesite metal methane a minute miles miners north return open-hearth operation outbursts oxide oxygen pig iron pitchblende places pounds production proportion radium radium bromide radium chloride Red Ash reduced return air roof sample sandstone shaft showing side slag slope sulphur surface syncline temperature tests tion tons Trollhattan upcast uraninite uranium and vanadium vanadium variations ventilated volume of gas volume of methane west return Wilkes-Barre
Page 2 - ... obtained at cost price only through the Superintendent of Documents, Government Printing Office, Washington, DC The Superintendent of Documents is not an official of the Bureau of Mines. His is an entirely separate office and he should be addressed: SUPERINTENDENT OF DOCUMENTS, Government Printing Office, Washington, DC The general law under which publications are distributed prohibits the giving of more than one copy of a publication to one person. The price of this publication is 10 cents.
Page 96 - BULLETIN 17. A primer on explosives for coal miners, by CE Munroe and Clarence Hall. 61 pp., 10 pis., 12 figs. Reprint of United States Geological Survey Bulletin 423. BULLETIN 20. The .explosibility of coal dust, by GS Rice, with chapters by JCW Frazer, Axel Larsen, Frank Haas, and Carl Scholz.
Page 238 - The selection of explosives used in engineering and mining operations, by Clarence Hall and SP Howell. 1913. 50 pp., 3 pis., 7 figs. BULLETIN 52.
Page 238 - TECHNICAL PAPER 6. The rate of burning of fuse as influenced by temperature and pressure, by WO Snelling and WC Cope. 1912. 28 pp. TECHNICAL PAPER 7. Investigations of fuse and miners' squibs, by Clarence Hall and SP Howell. 1912. 19 pp. TECHNICAL PAPER 11. The use of mice and birds for detecting carbon monoxide after mine fires and explosions, by GA Burrell. 1912. 15 pp. TECHNICAL PAPER 13.
Page 137 - BULLETIN 48. The selection of explosives used in engineering and mining operations, by Clarence Hall and SP Howell.
Page 88 - HNO3 and heat on a steam bath. Wh'en the solution is quiet, remove the cover and evaporate to dryness. Add 3 cc of HC1 and 5 cc of water to the residue and let it stand on the steam bath for a few minutes, stirring occasionally. Dilute with 25 cc of hot water, filter into a small beaker, and wash the residue with warm water.
Page 89 - OF ALUMINA. Nearly neutralize the filtrate with ammonia, have the solutions cool (not warmer than 30° C.), and add powdered carbonate of ammonia in about 2 grams excess to precipitate the aluminum. Let the precipitate settle, filter, and wash it with warm water. If the precipitate is bulky or is at all yellow, dissolve it in a little dilute H2SO4 and reprecipitate with carbonate of ammonia as described.
Page 89 - Heat the liquid containing the lead vanadate precipitate on the steam bath for 1 hour or more, .filter on a tight filter, and wash with warm water. Dissolve the precipitate in the least possible quantity of hot dilute nitric acid, neutralize as before, add 3 cc of nitric acid in excess, add 2...
Page 16 - The most typical ore is a sandstone so impregnated with yellow carnotite that the color is decidedly noticeable and containing small kidneys of brown sandy clay. The kidneys constitute a considerable part of some of the ore; in many cases they are thinly scattered through the sandstone. It seems to be generally acepted among the operators that the kidneys are rich in vanadium.