T 



CONSTRUCTION OF GALVANIC BATTERIES. J^Q 



is not visible when applied to heat : so that if these springs 

 are judiciously made of this metal, I am convinced they will 

 turn out a general benefit to the public, which is the princi- 

 pal object of, Sir, 



Your much obliged and obedient servant, 



39, Grafton-street, Dublin, JAMES SCOTT. 



June 20fA, 1808. 



P. S. Having for a length of time made use of this metal Superior to 

 in my compensation curbs, I consider it as very superior to st *ng*? r com " 

 •teei for every instrument of this kind. curbs. 



N. B. This paper would have appeared much earlier, had 

 it not been accidentally mislaid. 



% 



On the Construction of Galvanic Batteries. In a Letter from 

 a Correspondent, 



To Mr. NICHOLSON. 

 SIR, 



JtLVERY lover of science in the country must have felt Queries re- 



the great advantage of a philosophical Journal, in which he s P ectm g * he 



& • i • i- • i-i-i construction of 



never fails to meet with a judicious selection of the most galvanic batte- 



important discoveries, and whence he may hope to derive ries * 



information, that would be vainly sought after in any regular 



treatise. 



Some friends, who have united their efforts to follow Pro- 

 fessor Davy in his grand experiments on the decomposition 

 of the alkalis, would feel highly gratified by replies to the 

 following questionso 



What is the smallest number of Galvanic combinations, 

 and the smallest surface of plates, that is sufficient to de- 

 compose the fixed alkalis? And, what is tlje best solution 

 for charging a battery, so as to produce the greatest power? 



We have seen, that batteries formed of the common 

 rolled zinc do not act so powerfully as those, which have 

 been made with zinc plates that were cast, It is suid, that 

 sine is commonly alloyed, to make it roll the easier; but it 



it 



