Identifier: CollectionUnitev1Edis (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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tion, as the coils set up boi)h dy-namical and statical currents, no iron coresbeing used to retard the appearance of thecurrents. Instead of the coil of several wires wroundside by side, several long strips of tin-foil maybe placed side by side and insulated from eachother, and the currents passed through thestrips in the same manner as if they werewires. Another method consists in providing thetelephonic receivers with differential coils, andrunning another wire parallel with the tele-phonic wires, and iucluding in it the subsid-iary coil. I claim as my invention— The method herein specified of compensat-ing in one circuit for induced currents fromadjacent circuits, consisting in setting up areactionary induction by an induction-coilconnected with the adjacent circuit or circuits,substantially as set forth. Signed by me this 13th day of February, A.D. 1878. THOS. A. EDISON. Witnesses: Geo. T. Pinckney,Ohas. H. Smith. T. A. EDISON.Perforating-Pen. No. 203,329, Patented May 7, 1878.
Text Appearing After Image:
N.PETERS, PHOTO-LITHOGRAPHER, WASHINGTON, D C United States Patent Office. THOMAS A. EDISON, OF MENLO PABK, NEW JEESEY.IMPROVEMENT IN PERFORATING-PENS. Specification forming part of Letters Patent No. 203,329, dated May 7, 1878; application filed April 23,1877. To all wliom it may concern: Be it known that I, Thomas A. Edison, ofMenlo Park, in the county of Middlesex andState of New Jersey, have invented an Im-provement in Perforating-Pens, of which thefollowing is a specification: This invention is an improvement upon andmodification of the device patented to me, No.180,857, and dated August 8, 1876. The present invention relates to a means forreciprocating the needle that is used for per-forating the paper. I employ a motor that is revolved by footor other convenient power, and gives motionto a shaft with universal joints that passes tothe pen and revolves the mechanism that re-ciprocates the pen, and at the same time theuniversal joints allow the pen to be manipu-lated in writing o

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