Bulletin, Issue 67; Issue 70; Issue 72U.S. Government Printing Office, 1914 |
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Page 20
... square elec- trodes . The latter were built of four carbons , of about 12 by 12 inch section . The electrodes were threaded so as to permit their being joined by means of screw nipples , thus avoiding the waste of butt ends , as ...
... square elec- trodes . The latter were built of four carbons , of about 12 by 12 inch section . The electrodes were threaded so as to permit their being joined by means of screw nipples , thus avoiding the waste of butt ends , as ...
Page 32
... square and about 72 inches long . Of those first furnished , that part of the electrode projecting into the crucible would either break off com- pletely after it became heated , or else would spall off in large chunks and give trouble ...
... square and about 72 inches long . Of those first furnished , that part of the electrode projecting into the crucible would either break off com- pletely after it became heated , or else would spall off in large chunks and give trouble ...
Page 77
... square at the bottom and 6 feet square at the top . The roof is 31 inches above the hearth . The water - cooled steel electrodes ( fig . 29 ) , embedded in the hearth when new , project beyond the bottom of the hearth a short distance ...
... square at the bottom and 6 feet square at the top . The roof is 31 inches above the hearth . The water - cooled steel electrodes ( fig . 29 ) , embedded in the hearth when new , project beyond the bottom of the hearth a short distance ...
Page 81
... square at the bottom , widening out to 10 feet at the top . The silica brick roof is set 3 feet 9 inches above the hearth of dolomite . The bottom is tamped in to a depth of 20 inches . The furnace , with the exception that there are ...
... square at the bottom , widening out to 10 feet at the top . The silica brick roof is set 3 feet 9 inches above the hearth of dolomite . The bottom is tamped in to a depth of 20 inches . The furnace , with the exception that there are ...
Page 88
... square of the current and diminishes with an increase in the cross section of the conductor . There is an active and systematic circulation of the liquid bath , and the temperature is very evenly distributed throughout the bath . As far ...
... square of the current and diminishes with an increase in the cross section of the conductor . There is an active and systematic circulation of the liquid bath , and the temperature is very evenly distributed throughout the bath . As far ...
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Common terms and phrases
acid atmospheric pressure average basin blower Bureau of Mines carbon dioxide carnotite carnotite deposits cent carbon dioxide cent methane charge coal beds concentration containing cost crucible Crucible Steel cubic feet district east electric furnace electric steel furnace electrodes explosions feet a minute feet of methane ferrosilicon figs figure Fire Damp gangway gaseous gases Girod furnace gram hearth heat Héroult furnace Hillman holes inches induction furnace kilowatt-hours La Praz Liévin low-grade magnesite material metal method miles miners nace obtained operation outbursts oxide oxygen Paradox Valley pig iron pitchblende plant pounds power consumption power factor production proportion radium radium bromide radium chloride Red Ash reduced refining return air roof sample sandstone shaft showing slag solution sulphur surface temperature tests tion tons Trollhättan Ugine upcast uranium and vanadium Utah vanadate vanadium variations ventilation volume of gas volume of methane west return
Popular passages
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 236 - 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 236 - 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 20 - 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.
Page 96 - BULLETIN 44. First national mine-safety demonstration, Pittsburgh, Pa., October 30 and 31, 1911, by HM Wilson and AH Fay; with a chapter on the explosion at the experimental mine, by GS Rice.