APPENDIX. 
—<—- 
Notice of the Galvanic Deflagrator of Professor Rosrrt 
Hare, M.D. of the University of Pennsylvania, in a let- 
ter to that gentleman from the Editor. 
Yate Conurce, October 23d, 1821. 
., My Dear Sir, 
Iwas much impressed by your account of lie Galvanic 
Deflagrator, and of the fine experiments which you perform- 
-ed with it, as described in the 3d Vol. (pa. 105) of this 
Journal. By means of your kindness in sending me your 
original apparatus, (the only one which, as far as I am in- 
formed, has hitherto been constructed,) I had it in my pow- 
er, early in the month of June, to repeat your experiments 
in my public course of lectures. . Large numbers of intelli- 
gent persons attended, in addition to the classes, and the re- 
sults gave great pleasure and satisfaction. My health being, 
at that time, very feeble, it was not in my power to pursue 
the subject to the extent which I had intended, and expect- 
ing to resume it, I had. postponed the writing of a notice 
of yourinstrument, hoping that by and by, | could do it more to 
my own satisfaction. But as no one else appears to have re- 
peated your experiments, | have conciuded, even at this late 
 - mnoment, to throw a hasty notice into the Journal, although 
it has not been in my power to add any thing to the experi- 
ments performed in June. 
I cansay with truth that I consider your Deflagrator* as 
the finest present made to this department of knowledge, 
since the discovery of the Pile by Volta, and of the trough 
by Cruickshanks... The vessels being filled with the fluid, 
before hand, prevents any haste or confusion, and the advan- 
tage which your arrangement gives the operator, of immer- 
sing, at one quick movement, the whole of an extensive se- 
ties, is very great. Being perfectly..ready, and with the 
poles in his hand, the teacher only giving a. signal to his as- 
sistant to immerse the coils, instantly directs the whole 
power to the desired point, and produces results, which 
Doth in brilliancy and energy, totally surpass any thing be- 
* Your Calorimotor J have never possessed. 
vou. EV.:....No;. J. 26 
