File:Collection of United States patents granted to Thomas A. Edison, 1869-1884 (1869) (14570302587).jpg

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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has its flow 75checked at /, and forms a vacuous space,(marked a?,) and rising in c it trickles over at dand falls through the drop-tube A. The con-necting-tube c is always full of mercury, pre-venting any access of air from G to A. Hence 80if air by any means finds its way into G, itsimply impairs the vacuum in x, that in A andK being preserved and maintained at a highertension than that in x. What I claim is— 85 1. The combination, in a Sprengel or droppump, of two drop-tubes connected by a seal-ing-tube, substantially as shown and described. 2. In a Sprengel or drop pump, a drop-tubeconnected to a reservoir and provided with a 90contraction, and a separate drop-tube connect-ed to the body to be exhausted and to the firstdrop-tube, substantially as set forth. This specification signed and witnessed this19th day of January, 1881. THOS. A. EDISON. Witnesses: H. W. Seely,Ernest J. Berggren. (No Model.) T. A. EDISON. GOVERNOR FOB, ELECTRIC ENGINES. No. 248,434. Patented Oct. 18,1881.
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f\j J E5 J : I ;s; VE;slTD ^ = United States Patent Office. THOMAS A. EDISON, OF MENLO PARK, NEW JERSEY, ASSIGNOR TO THEEDISON ELECTRIC LIGHT COMPANY, OF NEW YORK, N. Y. GOVERNOR FOR ELECTRIC ENGINES. SPECIFICATION forming part of Letters Patent No. 248,434, dated October 18, 1881. Application filed August 9,1880. (No model.) Patented in Canada, Maseeh 31, 1881. To all idiom it may concern: Be it known that I, Thomas A. Edison, ofMenlo Park, in the county of Middlesex andState of New Jersey, have invented a new and5 useful Improvement in Electric Engines; andI do hereby declare that the following is a fulland exact description of the same, referencebeing had to the accompanying drawing, andto the letters of reference marked thereon. io This invention relates to a governor for elec-tro magnetic engines. Governors, as usually hitherto made for suchengines, have been arranged to break the cir-cuit upon the occurrence of a too great speed, 15 the circuit being again closed upon the proper

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