. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . (No Model.) No. 274,292. T. A. EDISON. SECONDARY BATTEEY. Patented Mar. 20, United States Patent Office© THOMAS A. EDISON, OF MENLO PARK, NEW BATTERY. SPECIFICATION forming part of Letters Patent No. 274,292, dated March 20, 1883. Application filed August 7,1882. (Nomodel.) To all whom it may concern: Be it known that I, Thomas A. Edison, ofMeulo Park, in the county of Middlesex andState of New Jersey, have invented a new and5 useful Improvement in Secondary Batteries,(Case No. 439;) and I do
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . (No Model.) No. 274,292. T. A. EDISON. SECONDARY BATTEEY. Patented Mar. 20, United States Patent Office© THOMAS A. EDISON, OF MENLO PARK, NEW BATTERY. SPECIFICATION forming part of Letters Patent No. 274,292, dated March 20, 1883. Application filed August 7,1882. (Nomodel.) To all whom it may concern: Be it known that I, Thomas A. Edison, ofMeulo Park, in the county of Middlesex andState of New Jersey, have invented a new and5 useful Improvement in Secondary Batteries,(Case No. 439;) and I do hereby declare thatthe following is a full and exact description ofthe same, reference being had to the accom-panying drawings, and to the letters of refer- to ence marked thereon. Heretofore in secondary batteries the elec-trodes have been formed of lead plates, or leadplates having oxide of lead secured thereto, orof lead plates carrying chemically-precipitated 15 metallic lead; but all these constructions havedefects which detract greatly from their effi-ciency. The simple lead plates present a verysmall surface, and hence have a low efficiency,and,
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