. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . metallic circuit interrupted attwo or more places, in combination with thefield-of-force magnet, the springs I n, connectedtogether and to one wire of the circuit, andthe intermediate spring, m, to theother wire ofthe circuit, substantially as set forth. 2. The combination, in a magneto - electricmachine, of a field-of-force magnet, revolvinghelix-section?, commutator-plates to which thehelix-sections are connected, the springs I mn, the secondary commutator blocks /*;, and ametallic bridge, i, to the same for maint
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . metallic circuit interrupted attwo or more places, in combination with thefield-of-force magnet, the springs I n, connectedtogether and to one wire of the circuit, andthe intermediate spring, m, to theother wire ofthe circuit, substantially as set forth. 2. The combination, in a magneto - electricmachine, of a field-of-force magnet, revolvinghelix-section?, commutator-plates to which thehelix-sections are connected, the springs I mn, the secondary commutator blocks /*;, and ametallic bridge, i, to the same for maintainingmetallic connection in the helices that are with-in the field magnets, substantially as set forth. 3. In a dynamo - electric machine, a shuntaround the helices of the field-of-force magnets,and means for opening and closing that shuntperiodically, for the purposes and substan-tially as set forth. Signed by me this 7th day of July, A. THOS. A. EDISON. Witnesses: S. L. Griffin,Francis It. Upton. No, 219,628. 1. A. EDISON,Electric-Light, Patented Sept. 16, United States Patent Office. THOMAS A. EDISON, OF MENLO PARK, NEW IN ELECTRIC LIGHTS. Specification forming part of Letters Patent No. 219,628, dated September 16, 1879; application fife? December 9, 1878. To all whom it may concern : Be it known that I, Thomas Alva Edison,of Menlo Park, in the county of Middlesex andState of New Jersey, have invented an Im-provement in Electric Lights, and the follow-ing is declared to be a description of thesame. The object of this invention is to produce acandle or light-giving body -by the incandes-cence of a conductor of electricity in the formof a cylinder, jmsm, or other mass of a sizeadapted to yield the required volume of light. The invention consists, in an electric-light-giving body formed of a conductor, such asfinely-divided platinum, iridium, ruthiniuin, orother metal difficult of fusion, incorporatedwith non-conducting material. The candle,
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