File:Collection of United States patents granted to Thomas A. Edison, 1869-1884 (1869) (14570307657).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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vethe end of the contraction being known as thesupply-tube and the part below such pointthe fall tube. At a little distance below gthe tube E enters G, preferably by a downward 5bend, E being the tube to which is attachedthe article or vessel to be exhausted of air. G, as here shown, is a vessel for catchingthe mercury passing through the pump, andkeeping the bottom of the tube or pump G 5sealed air-tight, the vent or overflow tube Gbeing above the bottom or end of G. Connected to F by a tube, F, is a McLeodgage, I, fur determining the degree of exhaus-tion. 6 What I claim is— In a Sprengel air-pump, the mercury-supplytube having formed integral therewith a con-traction above the fall-tube for regulating theflow of mercury, substantially as and for the 6purpose specified. This specification signed and wil nessed this5th day of December, 1881.^ ^ EDISON. Witnesses: H.W. Seely, Wm. H. Mead owe roet. (No Model.) T. A. EDISON. DYNAMO ELECTRIC MACHINE. No. 251,537. Patented Deo. 27,1881.
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United States Patent Office THOMAS A. EDISON/, OP MENLO PARK, NEW JERSEY.DYNAMO-ELECTRIC MACHINE. SPECIFICATION forming part of Letters Patent No. 251,537, dated December 27, 1881.Application filed August 30, 1881. (No model.) To all whom 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 Dynamo or MagnetoElectric Machines or Electric Engines; and Ido hereby declare that the following is a fulland exact description of the same, referencebeing had to the accompanying drawings, ando to the letters of reference marked thereon.The object I have in view is to produce sim-ple and efficient meansforconnecting the nakedcopper inductive bars in dynamo or magnetoelectric machines or electric engines having5 cylindrical armatures, the same being an im-provement upon the means shown for this pur-pose in Patent No. 242,898, gran ted to me June14, 1881. This I accomplish by the use of

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