. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . United States Patent Office. THOMAS A. EDISON, OF NEWABK, NEW IN GALVANIC BATTERIES. Specification formiDg 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 have been made with aplate of copper at the bottom of the glas
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . United States Patent Office. THOMAS A. EDISON, OF NEWABK, NEW IN GALVANIC BATTERIES. Specification formiDg 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 have 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 have discovered that when the sulphateof copper is placed below the copper po
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