. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . o the passageof the current, and as each succeeding sectionis placed in circuit the force of the curreut isdecreased and the brilliancy of the light cor- Corespondingly diminished, and as the key isagain turned back the resistance decreaseswhile the light increases. What I claim is— 1. The combination, with the incandescing 65conductor of an electric lamp and the key forcontrolling the circuit thereof, of an adjusta-ble resistance located within the base of thelamp and cut in or out of the circuit in any de-sired pr
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . o the passageof the current, and as each succeeding sectionis placed in circuit the force of the curreut isdecreased and the brilliancy of the light cor- Corespondingly diminished, and as the key isagain turned back the resistance decreaseswhile the light increases. What I claim is— 1. The combination, with the incandescing 65conductor of an electric lamp and the key forcontrolling the circuit thereof, of an adjusta-ble resistance located within the base of thelamp and cut in or out of the circuit in any de-sired proportion by the key, so that the lamp 70may be used at any desired power less thauits normal capacity, substantially as set forth. 2. A carbon resistance made substantiallyas described, and provided with a series of me-tallic contacts, in combination with a keyhav- 75ing an arm for completing ciicuit at any de-sired contact, substantially as set forth. This specification signed and witnessed this3d day of December, 1880. THOS. A. EDISON. Witnesses: H. W. Sebly,S. D. (No Model.) T. A. or Dynamo Electric Machine. No. 242,898. Patented June 14, 1881.
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Keywords: ., boo, bookcentury1800, booksubjectinventions, booksubjecttelephone
