Description of a Carbon Voltaic Battery. 



181 



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in the frame F F, figure 2, can rest on the edges of the outer 



penmente 



Fig. 1. 





In the usual form of Grove's battery, the porous cell is inextrica- 

 bly confined within the zinc plate, which rises on both sides of 

 it, and confines it in one position ; so that there is no way to 

 charge the cells, except by carefully pouring through a funnel, and 

 they must be discharged when done with, by inclining the appa- 

 ratus gradually on one side, until the nitric acid runs out 



In the form here proposed, the cups are all filled very expeditious- 

 ly, by pouring into each a measured quantity of acid ; and during 



