THE STORAGE OF ELECTRICITY. 
323 
charging battery or machine to the plate which was connected 
to the positive pole ; and it continues until the separated gases 
have all recombined to form water. 
Fig. 2. 
In 1859, a great improvement on the secondary battery was 
made by M. Gaston Plante, of Paris, who, after trying many 
different metals, selected plates of lead in preference to any 
other. Lead had been tried by Eitter and abandoned ; hut in 
Fig. 3. 
the hands of Plante, and latterly of Faure, it has afforded a 
practical solution of the problem. Plante takes two sheets of 
lead, A B, Fig. 2, with projections, d d', jutting from them, and 
