. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . ncreased de-mand. Upon cutting out of 7 the reverse operationtakes place. What I claim is— go 1. The combination, with a generator, of avariable resistance in its field-circuit, a mag-net in a derived circuit to the main or supplycircuit of the generator, and a movable con-tact-arm controlled by the magnet for effect- 95ing an automatic regulation of the field of thegenerator, substantially as set forth. 2. The combination of a generator, a resist- 251,555 ance in its field-circuit, an axial magnet com-posed of a he
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . ncreased de-mand. Upon cutting out of 7 the reverse operationtakes place. What I claim is— go 1. The combination, with a generator, of avariable resistance in its field-circuit, a mag-net in a derived circuit to the main or supplycircuit of the generator, and a movable con-tact-arm controlled by the magnet for effect- 95ing an automatic regulation of the field of thegenerator, substantially as set forth. 2. The combination of a generator, a resist- 251,555 ance in its field-circuit, an axial magnet com-posed of a helix and an electro-mag net as acore thereto, both included in one circuit de-rived from the main or supply circuit, and a5 movable contact-arm controlled by the mag-net and contacting with the resistance, sub-stantially as set forth. This specification signed and witnessed this2Gth day of February, 1881. THOS. A. EDISON. Witnesses: Seely,Richd. K Dyer. (No. Model.) T. A. EDISON. ■REGULATOR FOR MAGNETO OR DYNAMO ELECTRIC MACHINES. No. 251,556. Patented Dec. 27, United States Patent Office. THOMAS A. EDISON, OF MENLO PARK, NEW JERSEY, ASSIGNOR TO THEEDISON ELECTRIC LIGHT COMPANY, OF NEW YORK, N. Y. REGULATOR FOR MAGNETO OR DYNAMO ELECTRIC MACHINES. SPECIFICATION forming part of Letters Patent No. 251,556, dated Decernber 27, 1881. Application filed October 30, 1880. (No model.) To all whom lb m/iy concern: Be it known that I, Thomas A. Edison, ofMenlo Park, in the county of Middlesex andState of New Jersey, have invented a new and5 useful Improvement in Magneto or DynamoElectric Machines, ( Case No. 258;) and I dohereby declare that the following is a full andexact description of the same, reference being-had to the accompanying drawings, and to the 10 letters of reference marked thereon. As explained in a prior application for pat-ent by me made, the current used in my sys-tem is generated at and distributed from acentral station to and through the district of 15
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