274 Description of two new Voltaic Batieries. 
lation to this power, to any of the instruments reported, and 
certainly superior in point of convenience either to the coil 
of Colonel Offerhaus,* or thatof Mr. Pepys.t As it is ne- 
cessary, however, to have instruments capable of producing 
the other galvanic effects, it occurred to me to form a bat- 
tery of small plates upon the above plan. Fig. 5 represents 
one of this kind, with semi-circular plates, eight inches in 
diameter, and arranged as in the large apparatus. This is 
four feet in length, and contains one hundred and forty-four 
plates, namely, forty-eight of zinc and ninety-six of copper. 
Two of these placed parallel to each other, I have chosen 
to connect by an arc of thick brass wire at one end and at 
the other by having plates of copper counected with the 
terminating plates inside, fixed to the outside of the wheels, 
as atc, with a sheath to each to receive the ends of the con- 
ductors, as in fig. 6.. Tam preparing another battery of this 
kind, with a much larger number of smali plates. To fa- 
cilitate the work of soldering connecting pieces to plates 
situated close to each other, suppose the third of an inch, 
one or more straps must be soldered to the edge of each 
plate, before they are fixed in their places, and then, by 
causing one strap to lap over the other, they can be easily 
united by the soldering tool. 
You will perceive my dear Sir, that according to the ar- 
rangement of both these instruments, we possess the advan-. 
tage to be derived from the simultaneous immersion of all 
the plates, an advantage which has been so ably illustrated 
by my friend Dr. Hare’s calorimotor and deflagrator, and 
that by half a revoluticn of the wheels, which may be done 
in a few seconds by a slight effort, -the plates are all in the 
air, and may be easily washed by a little water poured from 
a garden pot, or other convenient vessel. In this position 
they will remain unaffected until required for operation. 
I am, dear Sir, 
our obed’t humble serv’t, 
ELISHA DE BUTTS. 
* Edinburgh Journal. Vol. VIII. + Brande’s Journal, 1823. 
* 
