RODEN HAUSER, W. The electric furnace and electric process of steel making. Jour. Iron and Steel Inst., vol. 79, 1909, No. 1, p. 261.

RODENHAUSER, W., AND SCHOENAUR,

Electric furnaces in the iron and steel

industry. Eng. translation by C. H. Von Baur.

ROWLANDS, T.

1913.

Induction-furnace progress. Trans. Am. Electrochem. Soc., vol.

17, 1910, p. 103; Metall, Chem. Eng., vol. 8, 1910, p. 337.

STANSFIELD, A. Production of pig iron from iron ore, carbon, and fluxes. Canadian Engineering, vol. 13, December, 1906, p. 437.、

STASSANO, E. Treatment of iron and steel in the electric furnace. Electrochem. Metall. Ind., vol. 6, 1908, p. 315.

The applications of the electric furnace to siderurgy. Trans. Am. Electrochem. Soc., vol. 15, 1909, p. 63; Electrochem. Metall. Ind., vol. 7, 1909, p. 254.

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VON BAUR, C. H. The Röchling-Rodenhauser furnace of the Crucible Steel Casting Co., Lansdowne, Pa. Iron Trade Rev., vol. 53, 1913, p. 153; Metall. Chem. Eng., vol. 11, 1913, p. 113.

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PUBLICATIONS ON MINING AND MINERAL TECHNOLOGY.

The following Bureau of Mines publications may be obtained free by applying to the Director, Bureau of Mines, Washington, D. C.: BULLETIN 10. The use of permissible explosives, by J. J. Rutledge and Clarence Hall. 1912. 34 pp., 5 pls., 4 figs.

BULLETIN 15. Investigations of explosives used in coal mines, by Clarence Hall, W. O. Snelling, and S. P. Howell, with a chapter on the natural gas used at Pittsburgh, by G. A. Burrell, and an introduction by C. E. Munroe. 1911. 197 pp., 7 pls., 5 figs.

BULLETIN 17. A primer on explosives for coal miners, by C. E. Munroe and Clarence Hall. 61 pp., 10 pls., 12 figs. Reprint of United States Geological Survey Bulletin 423.

BULLETIN 20. The explosibility of coal dust, by G. S. Rice, with chapters by J. C. W. Frazer, Axel Larson, Frank Haas, and Carl Scholz. 204 pp., 14 pls., 28 figs. Reprint of United States Geological Survey Bulletin 425.

BULLETIN 45. Sand available for filling mine workings in the Northern Anthracite Coal Basin of Pennsylvania, by N. H. Darton. 1913. 33 pp., 8 pls.. 5 figs. BULLETIN 46. An investigation of explosion-proof mine motors, by H. H. Clark. 1912. 44 pp., 6 pls., 14 figs.

1912. 44 pp.

BULLETIN 48. The selection of explosives used in engineering and mining operations, by Clarence Hall and S. P. Howell. 1913. 50 pp., 3 pls., 7 figs. BULLETIN 52. Ignition of mine gases by the filaments of incandescent electric lamps, by H. H. Clark and L. C. Ilsley. 1913. 31 pp., 6 pls., 2 figs. BULLETIN 47. Notes on mineral wastes, by C. L. Parsons. BULLETIN 53. Mining and treatment of feldspar and kaolin in the southern Appalachian region, by A. S. Watts. 1913. 170 pp., 16 pls., 12 figs. BULLETIN 60. Hydraulic mine filling; its use in the Pennsylvania authracite fields; a preliminary report, by Charles Enzian. 1913. 77 pp., 3 pls., 12 figs. BULLETIN 64. The titaniferous iron ores in the United States; their composition and economic value, by J. T. Singewald, jr. 1913. 145 pp., 16 pls., 3 figs. BULLETIN 65. Oil and gas wells through workable coal beds; papers and discussions, by G. S. Rice, O. P. Hood, and others. 1913. 101 pp., 1 pl., 11 figs. BULLETIN 70. A preliminary report on uranium, radium, and vanadium, by R. B. Moore and K. L. Kithil. 1913. 97 pp., 4 pls., 2 figs.

BULLETIN 71. Fullers' earth, by C. L. Parsons. 1913. 38 pp.

TECHNICAL PAPER 11. The use of mice and birds for detecting carbon monoxide after mine fires and explosions, by G. A. Burrell. 1912. 15 pp.

TECHNICAL PAPER 15. An electrolytic method of preventing corrosion of iron

or steel, by J. K. Clement and L. V. Walker. 1913. 19 pp., 10 figs. TECHNICAL PAPER 17. The effect of stemming on the efficiency of explosives,

by W. O. Snelling and Clarence Hall. 1912. 20 pp., 11 figs.

TECHNICAL PAPER 18. Magazines and thaw houses for explosives, by Clarence Hall and S. P. Howell. 1912. 34 pp., 1 pl., 5 figs.

TECHNICAL PAPER 21. The prevention of mine explosions; report and recommendations, by Victor Watteyne, Carl Meissner, and Arthur Desborough. 12 pp. Reprint of United States Geological Survey Bulletin 369.

TECHNICAL PAPER 22. Electrical symbols for mine maps, by H. H. Clark. 1912. 11 pp., 8 figs.

TECHNICAL PAPER 24. Mine fires, a preliminary study, by G. S. Rice. 1912. 51 pp., 1 fig.

TECHNICAL PAPER 31. Apparatus for the exact analysis of flue gas, by G. A. Burrell and F. M. Seibert. 1913. 12 pp., 1 fig.

TECHNICAL PAPER 41. Mining and treatment of lead and zinc ores in the Joplin district, Missouri; a preliminary report, by C. A. Wright. 1913. 43 pp., 5 figs.

TECHNICAL PAPER 55. The production and use of brown coal in the vicinity of Cologne, Germany, by C. A. Davis. 1913. 15 pp.

TECHNICAL PAPER 60. The approximate melting points of some commercial copper alloys, by H. W. Gillett and A. B. Norton. 1913. 10 pp., 1 fig.