Galvanism.— The Calorimotor.—The Deflagrator. 11 
in this way, is plainly a matter of fact; the only question is, 
whether the removal of this portion of heat, is adequate to 
account for the entire reduction of PINES oP point 
which a few experiments would decide 
In the department of GALVANISM, for the finest contribu- 
tions that have been made to the scienc e, within the last few 
years, we are indebted to Dr. Hare. His Calorimotor and 
. Deflagrator are instruments distinguished alike for the inge- 
nuity of their Fwagioarts and for the splendor of the phe- 
nomena which the uce. 
The peculiarity of ‘te Calorimotor, in point of principle, 
is, that its plates of copper are so connected with each other, 
and its plates of zinc with each other, as to make the whole 
equivalent to only one or two huge pairs a pple It had been 
observed before, that the heating powers of the Voliaic ap- 
paratus, with a given extent of surface, Se on the size 
of the plates, while its electrical powers, such as communi- 
cating the shock to the animal system, and effecting the de- 
composition of bodies, depended on their number. The 
thought occurred to Dr. Hare, that as the ordinary arrange- 
ments of the Voltaic apparatus combine the circumstances of 
size and number, so the substance afforded by such batteries, 
a compound of heat and electricity; and that if he could 
eke the whole series equivalent to a single pair of plates, 
the effects would be almost exclusively those of heat. The 
result corresponded entirely with his expectations. This in- 
strument exhibits the most intense light and heat, but scarcely 
any electrical effects. The experiments of Dr. Hare appear 
to me to render his theoretical views on this subject seemed 
probable, namely, that the product of the common Voltai 
battery is a compound of heat and electrici tricity. 
The Deflagrator consists of a series ‘of coils or plates of 
copper and zinc, so ar rranged, t 
1. The zinc is surrounded by ee copper. 
2. The metals can be instantaneously covered with the 
fluid. 
e fluid may be contained in a single Fe Ee other 
vessel, fain the insulation, between the members of the se- 
Ties usually attempted by rosin, glass or ROreslailess 
4. The series consists of a good many members, and 
not of a few huge ones, as in the Calorimotor. _ 
he chief peculiarity of the Deflagrator, is, that its 
whole metallic surface may be simultaneously immersed in 
