Description of two new Voltaic Batteries. 273 
the operator to experiment nonenintins the poles are 
brought to one end of the set of wheels, a brass bar almost 
as long as the axle is placed upon that side of the and 
which is uppermost when the plates are immerse 
with the exception of the termunanas mipsel passes at 
all the rest near their centres. One end of this bar is con- 
nected by copper straps to the positive ds and the other 
to a copper strap which, rising from the axle, | praves through 
a slit in the front | ‘mbesis itis then bent down, and fas 
similar brass plate.* These brass plates, ais the pinceny 
= experiment, mounted, are represented ata. a. In fig. 
5 pate the wheels are in the position eich exhibits the 
plates out of the fluid. The pincers and brass plates are 
It is evident that, when the 
ide are immersed in the fluid of the cistern, the dotted 
lines b. b. mark the places which properly belong to them, 
and which must then be uppermost. When the operator 
has finished, and is about to turn the plates out of the fluid, 
he must first draw the pincers, &c. out of the brass plate. 
That this may be done almost instantaneously will be 
ceived by referring to fig. 3, which represents one o the 
brass plates with the pincer holder in its place—fig. 4 rep- 
nts one of the pincers. It is hardly necessary to state, 
werful to melt the metals, ignite charcoal intensely, &c. 
ith one part of nitric ¢ acid 1 to ninety of water, I 
to be impossible to fix plating wire, one tenth of - . 
thick, and several inches long, in the pincers, as it melt- _ 
ed instantly when in contact with the poles. In conformi- — 
ty with common observation relative to ge Pere it a 
duces neither shock nor SI 
* These two straps are well varnished. 
Yor. VIIt. =_No. 9. 35 
