24 HISTORY OF GALVANISM. 



that a distinct shock was felt in the arms. This 

 fully established the opinion that had been formed, 

 and was generally adopted, of the identity of elec- 

 tricity and galvanism; although there were still 

 some circumstances connected with the latter, 

 which appeared not to be completely analogous to 

 the usual operations of the electric fluid. 

 Galvanic He found that forty pairs of the metallic disks, 

 with the proper number of pieces of moistened 

 card interposed, were sufficient to produce a shock, 

 which was very distinctly felt in the hands and 

 arms, and that by increasing the number of pairs, 

 the power of the pile was proportionally aug- 

 mented. In order to produce the full effect, it was 

 found necessary that two pieces of metal, either 

 composing the extremities of the instrument, or 

 in contact with them, should be firmly grasped by 

 the two hands ; and the shock might, in this case, 

 be repeated for any number of times, as long as 

 the pasteboard between the two metals remained 

 sufficiently moist. Volta conceived that the newly 

 invented apparatus was analogous in its action to 

 the electrical organ of the torpedo. 



Couronne He afterwards constructed another apparatus, 

 Fig. 3. ' or rather arranged the component parts of the pile 

 in a different form. It consists of a set of small 

 glasses, placed side by side, and containing water 

 or some saline solution. A number of metallic arcs 

 are then procured, having one end composed of 

 zinc, and the other of silver or copper ; these arcs 

 are inserted into the glasses in a uniform order, 



