. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . rior con-tact, and thereby develop incandesence at thispoint. I am also aware that rods of carbon havebeen supplied automatically from a holder. 80Therefore I do not claim the same. J claim as my invention— 1. The combination, with the carbon rod,in an electric lamp, of a metal rod that is diffi-cult of fusion and smaller than the carbon 85rod, so as to produce a resistance at the. point of contact between the carbon and the metal,and a weight to maintain the necessary press-ure at the point of contact, substantiall
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . rior con-tact, and thereby develop incandesence at thispoint. I am also aware that rods of carbon havebeen supplied automatically from a holder. 80Therefore I do not claim the same. J claim as my invention— 1. The combination, with the carbon rod,in an electric lamp, of a metal rod that is diffi-cult of fusion and smaller than the carbon 85rod, so as to produce a resistance at the. point of contact between the carbon and the metal,and a weight to maintain the necessary press-ure at the point of contact, substantially asset forth. 9° 2. The case H, having an inclined bottomand adapted to receive several carbon rods, iucombination with the metallic rod B andmeans for guiding the carbon and maintain-ing the pressure thereof at the point of con- 95tact, substantially as set forth. Signed by me this 23d day of January, 1879. THOMAS A. EDISON. Witnesses: S. L. Griffin,Wm. Cabman. T. A. of Preparing Autographic Stencils for Printing. No. 224,665. Patented Feb. 17, N. PETERS, PHOTO-LITHOGRAPHER. WASHINGTON, O G. United States Patent Office THOMAS A. EDISON, OP MENLO PAEK, NEW OF PREPARING AUTOGRAPHIC STENCILS FOR PRINTING. SPECIFICATION forming part of Letters Patent No. 224,665, dated February 17, 1880. Application filed March 17, 1879. To all whom it may concern : Be it known that I, Thomas A. Edison, ofMenlo Park, in the State of New Jersey, haveinvented an Improvement in Preparing Sten -5 oils for Printing, (Case No. 173,) of which thefollowing is a In Letters Patent No. 180,857, granted, tome, means for perforating paper by a rapidly-reciprocating needle are set forth; also, a io method of printing by forcing a semi-fluid inkthrough the perforations. My present invention relates to a peculiarstencil-sheet, and to the method of and a meansfor preparing the perforated stencil of paper 15 or similar material. I make use of a slab or pla
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