. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . (No Model.) T. A. for Electro-Magnetic Motors No, 228,617. Patented June 8, 1880. Fn1-. photo-lithographer, Washington, o. c. United States Patent Office. THOMAS A. EDISON, OF MBNLO PAEK, NEW FOR ELECTRO-MAGNETIC MOTORS. SPECIFICATION forming part of Letters Patent No. 228,617, dated June 8, 1880. Application filed March 20,1880. (JsTo model.) 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 i
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . (No Model.) T. A. for Electro-Magnetic Motors No, 228,617. Patented June 8, 1880. Fn1-. photo-lithographer, Washington, o. c. United States Patent Office. THOMAS A. EDISON, OF MBNLO PAEK, NEW FOR ELECTRO-MAGNETIC MOTORS. SPECIFICATION forming part of Letters Patent No. 228,617, dated June 8, 1880. Application filed March 20,1880. (JsTo model.) 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 a new and 5 useful Improvement in Electro-Motors, (CaseNo. 207;) and I do hereby declare that the I following is a full and exact description of the I same, reference being had to the accompauy- E ing drawings, and to the letters of marked thereon. In using electro-motors, especially for actu-ating light machinery, it is very desirable that I the rate of speed of the actuated machine beunder control of the operator, and that the$5 means of control be simple, effectual, and easyof application. Hitherto this has been at-tempted only through cpntrolliug
Size: 1310px × 1907px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1800, booksubjectinventions, booksubjecttelephone
