Design of a universal portable electric drill . 1,053,940. J. BURKE. UNIVERSAL FILED SEPT. 9, 1909. Patented Feb. 18,1913. 3 SHEETS-SHEET ^mt^c5^e;M\A/ \>y \X/ \X/ VXy; VC^ ^vx^y^o^ UNITED STATES PATENT OFFICE. JAMES BURKE, OF ERIE, PENNSYLVANIA. ASSIGNOR TO BURKE ELECTRIC COMPAinr, A CORPORATION OF PENNSYLVANIA. UNIVERSAL MOTOR. 1,053,940. Specification of Letters Patent. Patented Feb. 18,1913. Application filed September 9, 1909. Serial No. 516,898. To all whom it may concern: Be it known that I, J.\mes Br uKE. a citi-zen of the United States, residing at Erie,in the
Design of a universal portable electric drill . 1,053,940. J. BURKE. UNIVERSAL FILED SEPT. 9, 1909. Patented Feb. 18,1913. 3 SHEETS-SHEET ^mt^c5^e;M\A/ \>y \X/ \X/ VXy; VC^ ^vx^y^o^ UNITED STATES PATENT OFFICE. JAMES BURKE, OF ERIE, PENNSYLVANIA. ASSIGNOR TO BURKE ELECTRIC COMPAinr, A CORPORATION OF PENNSYLVANIA. UNIVERSAL MOTOR. 1,053,940. Specification of Letters Patent. Patented Feb. 18,1913. Application filed September 9, 1909. Serial No. 516,898. To all whom it may concern: Be it known that I, J.\mes Br uKE. a citi-zen of the United States, residing at Erie,in the county of Erie and State of Pennsyl-5 vania, have invented certain new and in Motors, ofwhich the following is a full, clear, and ex-act specification. This invention relates to electric motors. 10 and more ])articidarly relates to an electricmotor which is adapted to be actuated by jeither sin<;le phase alternatinjr currents ordirect currents, and to a method of varyingthe speed and changing the direction of ro- 15 tation of the motor when supplied withalternating current of the same voltage. It has heret
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttheses, bookyear1920
