Identifier: CollectionUniteVol2Edis (find matches)
Title: Collection of United States patents granted to Thomas A. Edison, 1869-1884
Year: 1869 (1860s)
Authors: Edison, Thomas A. (Thomas Alva), 1847-1931 Peters, N. (Norris), lithographer Hammer, William Joseph, 1858-1934, former owner. DSI Edison, Thomas A. (Thomas Alva), 1847-1931, inscriber. DSI United States. Patent Office
Subjects: Catalogs Patents Edison, Thomas A. (Thomas Alva), 1847-1931 Inventions Telegraph Electric machinery Electric apparatus and appliances Phonograph Telephone Motors Catalogs Patents Catalogs Patents Catalogs
Publisher: Washington, D.C. : U.S. Patent Office
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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zation,ready to have a bulb blown over it. I claim as my invention— 1. Au electric lamp for giving light by in- 75candescence, consisting of a filament of carbon of high resistance, made as described, and se-cured to metallic wires, as set forth. 2. The combination of carbon filaments with 1a receiver made entirely of glass and conduct- 8c!ors passing through the glass, and from whichreceiver the air is exhausted, for the purposesset forth. 3. A carbon filament or strip coiled andconnected to electric conductors so that only 85a portion of the surface of such carbon con-ductors shall be exposed for radiating light, as set forth. 4. The method herein described of securingthe platina contact-wires to the carbon fila- gqment and carbonizing of the whole in a closedchamber, substantially as set forth. Signed by me this 1st day of November,A. D. 1879. THOMAS A. EDISOK Witnesses: S. L. Griffin,John F. Eandolph. T. A. EDISON.Electric-Lighting Apparatus. No. 224,329. Patented Feb. 10, 1880.
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N. PETERS, PHOTO-LITHOGRAPHER, WASHINGTON. D. C. United States Patent Office THOMAS A. EDISON, OF MENLO PARK, NEW JEESEY.ELECTRIC-LIGHTING APPARATUS. SPECIFICATION forming part of Letters Patent No. 224,329, dated February 10, 1880. Application filed February 3, 1879. To all whom it may concern: Be it known that I, Thomas A. Edison, ofMeulo Park, in the county of Middlesex andState of New Jersey, have invented an Im-5 provement in Electric-Lighting Apparatus,(Case No. 170;) and the following is declaredto be a description of the same. The object of this invention is to produceelectric illumination by the incandescence of10 carbon. The invention consists in making the twopoles dissimilar, one being of the carbon inthe form of a slender rod, and which servesto give light, while the other is of platinum 15 or platinum-iridium alloy, against which therod presses. The inferiority of contact which takes placebetween the metal and the carbon creates aconsiderable resistance, which, heating t

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