. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . e magnet M, which, acting inopposition to the magnet M, causes the arma- goture A to drop and let the carbon C fall theproper distance. It is evident that in practicethis operation after the arc is once formedwould be a continuous one. What I claim is— 95 1. In regulating mechanism for arc-lamps,the combination of the opposing solenoids orelectro-magnets located one in theline and the 297 other in a shunt around the arc, both of suchsolenoids or electro-magnets having the sameresistance, substantially as set forth.
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . e magnet M, which, acting inopposition to the magnet M, causes the arma- goture A to drop and let the carbon C fall theproper distance. It is evident that in practicethis operation after the arc is once formedwould be a continuous one. What I claim is— 95 1. In regulating mechanism for arc-lamps,the combination of the opposing solenoids orelectro-magnets located one in theline and the 297 other in a shunt around the arc, both of suchsolenoids or electro-magnets having the sameresistance, substantially as set forth. 2. In regulating mechanism for arc-lamps,5 the solenoid or electro-magnets of the same re-sistance located in the line and in a shuntaround the arc, in combination with a shuntaround the solenoid or electro-magnet in theline, substantially as set forth. ,580 This specification signed and witnessed this7th day of November, 1881. THOS. A. EDISON. Witnesses: Eichd. N. Dyer,H. W. Seely. (No Model.) T. A. EDISON. INCANDESCENT ELECTRIC LAMP. No. 297,581. Patented Apr. 29, United States Patent Office. THOMAS A. EDISON, OF MENLO PABK, NEW JEBSEY, ASSIGNOR TO THEEDISON ELECTRIC LIGHT COMPANY, OP NEW YOEK, N. Y. INCANDESCENT ELECTRIC LAMP. SPECIFICATION forming part of Letters Patent No. 297,581, dated April 29, 1884. Application filed September 22,1882. (No model.) To all whom it may concern: Be it known that I, Thomas A. Edison, ofMenlo Park, in the county of Middlesex andState of New Jersey, have invented anew and5 useful Improvement in the Manufacture of In-candescing Electric Lamps, (Case No. 483,) ofwhich the following is a specification. The object of this invention is to render theinclosing-globes of incandescing electric lamps io as free from air as possible; and said inventionconsistsin providingsueh globes with aresidualatmosphere of carbonic monoxide as nearly aspossible free from air. To accomplish this, Ifirst remove the air from the globe as com- 15 pletely as it
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