304 



LOCALIZED ELECTRIZATION. 



Fig. ST. 

 Part of the chloride of silver battery. 



Fig. 88. 

 Internal view of the chloride of silver battery. 



(figs. 87 and 88) of a plate of zinc, Z, and a plate of silver, Y, over 

 which is fused a certain quantity of chloride of silver. It is then 

 inclosed in a covering of fine tissue, to prevent the reduced silver 

 being precipitated to the bottom of the cell. The whole is con- 

 tained within a sort of box of hard caoutchouc, closed by a screwed 

 stopper, and filled up with water containing five parts of sea-salt 

 in every hundred. The projections of pure silver, V, V, to which 

 the plates Z and Y are secured, convey the current outwards. 

 J, K, is a caoutchouc band, which holds the plates together, while 

 the intervening caoutchouc cushions, I I', maintain them at a 

 constant distance. 



" The quantity of chloride of silver is such that the battery will 

 continue in steady action for ten hours with constant intensity, 

 the circuit being completed by the induction coil. 



"When the battery is exhansted, it is sufficient to unscrew the 

 cover, and to attach a fresh plate, Y, of chloride of silver, with 

 which one should be furnished in advance. The reduced silver 

 being all recovered, the expense consists only in manipulation, 

 and in converting the reduced silver into chloride. 



" This battery affords the inestimable advantage of remaining 

 always ready, and in its place in the apparatus, for any length of 

 time without alteration, as the chemical action which determines 

 the reduction of the nitrate of silver does not occur unless the 

 circuit is complete. 



" According to the estimate given in the note above, we may 

 say that M. Gaiffe's two elements are equal, in electro-motor 

 power, to one element of Bunsen's. 



