Journal . ydrazine hydrate. —F. SODN. Iron alloy for dynamo-eleclric purposes ; Process of manufacturing an . W. Riibel, Berlin. Pat. l,i:!0,678, March 2, 1915. Date ofappl., July 9, 1912. See Addition of Julv 10. 1912, to Fr. Pat. 429,758 of 1911 ; this J., 1913, 146. Metals from low percentage ores ; Process for ex-tracting . 11. S. Mackav, Norwich, Conn., Eng. Pat. 26,138, Nov. 14, 1913. See Pat. 1,094,371 of 1914 ; this J., 1914, 598. Sulphide ores ; Concentration of - Separation and De Bavays Processes AustraliaProprietarv, Ltd., Melbourne, Australia. 5856, March
Journal . ydrazine hydrate. —F. SODN. Iron alloy for dynamo-eleclric purposes ; Process of manufacturing an . W. Riibel, Berlin. Pat. l,i:!0,678, March 2, 1915. Date ofappl., July 9, 1912. See Addition of Julv 10. 1912, to Fr. Pat. 429,758 of 1911 ; this J., 1913, 146. Metals from low percentage ores ; Process for ex-tracting . 11. S. Mackav, Norwich, Conn., Eng. Pat. 26,138, Nov. 14, 1913. See Pat. 1,094,371 of 1914 ; this J., 1914, 598. Sulphide ores ; Concentration of - Separation and De Bavays Processes AustraliaProprietarv, Ltd., Melbourne, Australia. 5856, March 7, 1914. Under Int. Conv.,April 3, Ft. Pat. 469,677 of 1914 ; this J., 1915, 35. 432 Cl. XI.—ELECTRO-CHEMISTRY. [April 30, MdijHeiic separator. G. UUiich, Magdeburg,Assignor to F. Krapp , Gnisonwerk,Magdeburg-Buckau, Germany. , March 2, Date of appl., , 1913. See Fr. Pat. 464,15tj of 1913 ; this J., 1914, 425. Desiiljihurishig ores ; Process for -. G. Fusina, Genoa, Italv. Pat. .March 16,1915. Date of appl., April 25, 1912. See Fr. Pat. 442,280 of 1912 ; this J., 1912, 931. XL—ELECTRO-CHEMISTRY. Electrical conductivity above 1500° C. of vapours atnormal pressure; Methods, data, and ?icic apparatus for measuriiuj . E. F. Northrup. J. Franklin Inst., 1915, 179, 337—352. Preliminary experiments showed the characterof the electrical conduction of metallic vapours todepend upon the form (and probaljly the material)of the container, theapplied voltage and itsdirection, the tempera-ture, the nature of themetal, and the frequencywhen an alternatingvoltage was employed ;and it was found neces-sarj- to make the meas-virements with which could becommutated. and thenrepeat them with alter-nating of differentknown frequencies. Thevertical electric furnaceemployed had a cylindri-lal chamber, 2-2 cm. indiameter, and a heatinglength of 13 cm. Aninterchangeable heater-unit of graphite, employ-in
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