I. BATTERIES. 305 



judged to be the case, the stopper is inserted; the hydrogen will now rapidly 

 descend in all the tubes until the zinc is laid bare, and then remain stationary. 

 A gas battery is now obtained, the terminal wires of which will give the usual 

 voltaic effects, the atmospheric air supplying an inexhaustible source of 

 oxygen, and the hydrogen being renewed as required by the liquid rising to 

 touch the zinc ; by supplying a fresh piece of zinc when necessary it be- 

 comes a self-charging battery, which will give a continuous current; no new 

 plates are ever needed ; the electrolyte is never saturated, and requires no 

 renewal except the trifling loss from evaporation, which indeed is lessened, if 

 the battery be in action, by the newly composed water. 



1263. Element of M. Becquerel's Sulphate of Copper 

 Battery. Conservatoire des Arts et Metiers, Paris. 



1264. Twelve Elements of Galvanic Batteries on different 

 systems, by Ruhmkorff. Conservatoire des Arts ct Metiers, Paris. 



1266. Smee's Battery. Six cells, with arrangement for 

 raising the plates out of the cells. James How fy Co. 



1266a. Set of Six Cell Smee's Batteries. 



E. Cetti and Co. 



1269. Grove's Nitric Acid Battery. Elliott Brothers. 



1270. Paure's Nitric Acid Battery. Elliott Brothers. 



The advantages offered in this battery are, greater constancy ; less incon- 

 venience from fumes, the porous cell* being a stoppered bottle ; and it not 

 being necessary to amalgamate the zincs, common salt being used in the outer 

 cell. 



1271. Glass Battery Cell, with two carbon and two zinc 

 plates. Reiser and Schmidt, Berlin. 



1272. Glass Battery Cell, with two carbon and one zinc 

 plate. Keiser and Schmidt, Berlin. 



1273. Glass Battery Cell, with one carbon and one zinc 

 plate. Keiser and Schmidt, Berlin. 



1274. Dipping-Battery, with 10 elements, of the exhibitors' 

 own construction. Keiser and Schmidt, Berlin. 



1275. Dipping-Battery, with 16 elements, with pachy trope 

 of the exhibitors' own construction. Keiser and Schmidt, Berlin. 



1276. Battery for Field Telegraph Service, constructed 

 for the Prussian Railway Battalion according to the plan of 

 Captain Witte. Keiser and Schmidt, Berlin. 



1277. Leclanche Cell, for working house telegraphs, modified 

 by the makers. Keiser and Schmidt, Berlin. 



40075. U 



