288 Mr. Gassiot on the relation of Electrical i^ Chemical Actio7is 



Fig. 2 is a single cell; g^ a glass vessel; c, copper; r, zinc. 

 Fig. 3, one of the boards as it appears when removed from 



Fig. 1. 



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Fig. 2. 



Fig. 3. 





Fig. 6. 



the entire series. Fig. 4, a double electroscope. Fig. 5, a 

 Harris's single-leaf electroscope. Fig. 6, another electroscope, 

 having two separately insulated gold leaves, b V : in addition, 

 I used a delicate galvanometer, and a solution of iodide of po- 

 tassium for the detection of currents and of chemical action. 

 The battery was charged, by carefully filling each cell with 

 rain water. 



