. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . (No Model.) T. A. EDISON. DYNAMO ELECTRIC MACHINE. No. 297,582. Patented Apr. 29, N, PETERS, Pholo-Litl>oftr;ip!ior, Washington, D. C. United States Patent Office. THOMAS A. EDISON, OP MENLO PAEK, NEW MACHINE. SPECIFICATION forming part of Letters Patent No. 297,582, dated April 29, 1884. Application filed June J9, 1883. (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 an
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . (No Model.) T. A. EDISON. DYNAMO ELECTRIC MACHINE. No. 297,582. Patented Apr. 29, N, PETERS, Pholo-Litl>oftr;ip!ior, Washington, D. C. United States Patent Office. THOMAS A. EDISON, OP MENLO PAEK, NEW MACHINE. SPECIFICATION forming part of Letters Patent No. 297,582, dated April 29, 1884. Application filed June J9, 1883. (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-Electric Ma-chines, (Case No. 575,) of which the followingis a specification. In the operation of large dynamo-electricmachines it is sometimes found that when a io heavy load is on the machine the resistanceto the revolution of the armature is such asto tend to draw the wires wound thereon outof place, a strain being produced on said wireswhich might in some cases be so great as to 15 break the connections between a coil and thecommutator. The object of my invention is to obviatethis armature-core which I prefer t
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