SECONDARY BATTERY. BY GEO. H. HOPKINS. Fig. 3PLATES CONNECTED. CURIOUSLY WORN GEAR WHEEL. Locomotive in Motion Struck by Lightning. Fig. 2ROUGHENING THE PLATE. Fig 4COMPLETE CELL. CURIOUSLY WORN GEAR WHEEL. A Mountain Electric Railway. by wedges. Fig. 1PLATES OF SECONDARY BATTERY., scientific american, 1889-07-13
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