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Litteratur. 681 O’Meara. Electric cooking apparatus. ü. S. P. Nr. 446 174. Off. Gaz. 54, 730. Perrine. The practical aspects of electric welding. Electr. World 17, 339, 396, 421. Electr. New-York 11, 600. Electr. London 27. 223. Rasmussen. Electric clamp. U. S. P. Nr. 458 188. Off. Gaz. 56, 943. Rich. Electric heater. U. S. P. Nr. 447 353. off. Gaz. 54, 1140. Richard. La soudure electrique (Thomson. Wood, Ries. Dewey, CäRPENTER, SLAWIANOFF). Lum. electr. 42, 151. - — La soudure electrique (Thomson. Coffin. Dewey, Lemp, Kohlenhalter von Werndley u. Foster, Burton). Lum. electr. .39, 451. Ries. Electric riveting apparatus. U. S. P. Nr. 452 042. off. Gaz. 55, 764. Electr. Rev., New-York 18, 176. Western Electr. 8, 290. — — Riveting by electricity. U. S. P. Nr. 465 089. Off. Gaz. 57. 1481. Western Electr. 9, 371. — —■ Portable electric welding apparatus (Rollwagen zur Ver schweissung von Schienen, Leitern etc.). U. S. P. Nr. 444 855. off. Gaz. 54, 292. — — Art of repairing metal structures by the aid of electricity. Apparatus for hardening and tempering Steel and iron. U. S. P. Nr. 453162—453 164. Off. Gaz. 55, 1127. Western Electr. 8, 321. Robinson. Method of and apparatus for electric soldering. U. S. P. Nr. 449 258. Off. Gaz. 54, 1763. C. and S. Robinson. Electric oil-well heater. U. S. P. Nr. 457 457. Off. Gaz. 56, 704. Robinson and Wheatley. Enamelling metals. Engi. Pat. 1890, Nr. 1894. Industries 10, 168. Rühlmann. Zu dem Aufsatz: Ueber die Verwendung eines mag netischen Feldes bei Löth- und Schweissarbeiten mit dem elek trischen Lichtbogen (Controverse). Elektrot. ZS. 1891, 23. Slawianoff. Verfahren zum Verdichten von Metallgüssen ver mittelst Elektricität. D. R. P., CI. 31, Nr. 57 417. Patbl. 1891, Auszüge 616. ZS. f. angew. Cliein. 1891, 723. — — Improvements in the process and apparatus for electrical Casting of metals. Engi. Pat. 1890, Nr. 16 279. Electr. Rev. 29, 519. Stuart. Electric förging (theuer bei grossen Massen). Electr. New- York 11, 680. El. Thomson. Method of electric welding. U. S. P. Nr. 444 926 —444 9.8, 444 946. Off. Gaz. 54, 315, 322. Electr. Rev., New-York 17, 296. Method of electric welding. Securing metal bands on wooden