. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . etard itsspeed. This slight diminution of speed causesthe governor-ball to fall and breaks the cir-cuit at 7 18, and upon Jhe speed again in-creasing the circuit is again closed by 7 and18 coming in contact, and the speed is checked,as before. In the aforesaid patent the contact of 7 and18 by increased speed lessens the current tothe motor. In the present instance the mag-netic brake formed by the magnets I checksthe speed. The cores of these magnets mightbe loose within the helices; or the magnetsmight be upon a sp
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . etard itsspeed. This slight diminution of speed causesthe governor-ball to fall and breaks the cir-cuit at 7 18, and upon Jhe speed again in-creasing the circuit is again closed by 7 and18 coming in contact, and the speed is checked,as before. In the aforesaid patent the contact of 7 and18 by increased speed lessens the current tothe motor. In the present instance the mag-netic brake formed by the magnets I checksthe speed. The cores of these magnets mightbe loose within the helices; or the magnetsmight be upon a spring-arm, so as to be broughtinto contact with the shaft by the attraction,if desired. I claim as my invention— The speed-regulator consisting of the elec-tro-magnet I, shaft a, and governor, in combi-nation with the circuit-closer and pulsator,substantially as and for the purposes set forth. Signed by me this 7th day of March, A. THOMAS A. EDISON. Witnesses: Geo. T. Pinckney,Chas. H. Smith. No. 142,999. T. A. Batteries. Patented September 23, United States Patent Office. THOMAS A. EDISON, OF NEWABK, NEW IN GALVANIC BATTERIES. Specification forming part of Letters Patent No. 142,999, dated September 23, 1873; application filed November 5, 1872. To all whom it may concern: Be it known that I, Thomas A. Edison, ofNewark, In the county of Essex and State ofNew Jersey, have invented an Improvementin Galvanic Batteries, of which the followingis a specification: Galvanic batteries Lave been made with aplate of copper at the bottom of the glass jarin which the zinc is suspended. The zinc hasbeen attached adjustably by arms, and thecopper in some instances has been a plateplaced edgewise in the bottom of the cell. Inall instances the sulphate of copper has beenplaced around and above the copper plate,and in practice it is found that the zinc be-comes discolored and its efficiency is injuredby a coating or deposit from the blue vitriol.
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