272. ~—Ss«zDescription of two new Voltme Batterres, 
the hands of other experimentalists. My motive for ad- 
dressing you now is merely to describe the plan which I 
have adopted, as I have found it to be eminently useful in 
relation to the objects to which I have alluded. ‘The re- 
sult of a series of experiments in which [ am engaged shall 
be communicated to you for a future number. . 
_ Eight wheels (see plate III.) made of strong pieces of eo 
‘plank, screwed to each other transversely, four feet in di- ‘ 
ameter and one inch and five-eighths in thickness, are pla- 
ced upon an axle six inches in diameter, and five feet nine 
inches in length, having brass gudgeons one inch and a hall 
thick, at each extremity. These wheels are arranged in 
x 
te Pa 
__ into their edges, by which they are firmly connected. Five 
is separated about two inches from the next, as they are 
all intended to revolve in a cistern with divisions. The 
plates are counterbalanced by pieces of lead, painted and ‘ 
attached to the cross pieces on the opposite 
ge of the first plate of the next division | 
rent electrical state. L : 4 
