Dr. Hare’s Galvame Deflagrator. 2: 
Deflagrator that we can ‘suspend the operation at-any’ me 
ment, with the same facility with which/it was commenced. 
A. lool; directed to the assistant, is’ sufficientto' raise the coils 
out of the fluid. ‘All action instantly ceases—neither the 
metal nor the fluid are wasting any farther, and the lecturer 
is:therefore at ease while he illustrates and reasons, and 
when he is ready and not before, he proceeds to his next 
experiment. In the mean time, the instrument, during a 
certain period, rather gains than loses strength, by the rais- 
ing of the coils. It seems as if the imponderable fluids, 
partially exhausted from it by its continued action, had time 
again to flow in from surrounding objects, and thusto impart 
new energy: I found the power of the instrument to’ last 
for several days, although declining, and the same charcoal 
points, when well prepared,* would also continue to operate 
for several days. When the coils, after immersion, had 
been suspended, for some hours, in the air, a coating of 
green oxid or carbonat of copper always formed on one 
part of the outside-of the copper coils, and on the same part 
invall, but no where else.” If I do not misremember, it col= 
lected next to the negative pole, but was, of course, always 
removed by the next immersion, though it was formed 
again at the next suspension. 
One circumstance occurred during these experiments, 
which demands farther attention. 
In the hope of uniting the power of your Deflagrator, with 
that of the common galvanic battery; I connected your in- 
strument with the powerful one mentioned above. Both 
instruments, when separately used, acted, at the time; 
with great energy, producing both their appropriate and 
common effects, in a very decided manner; but, on 
connecting by the proper poles, the battery of six hun 
dred and twenty pairs, with the deflagrator of eighty coils, 
I was greatly surprised and disappointed, at finding the pow= 
er of both instruments so completely paralyzed, that, at the 
points where a moment before, and when separate, a streani 
of light and heat, hardly to be endured by the eye, was 
poured forth—now, when connected, bothinstruments could 
scarcely produce the minutest spark. On separating the in- 
struments, they both resumed their activity ; on again ‘con- 
necting them, it was again destroyed, and so on, as often as 
* By igniting pieces of mahogany beneath sand in a crucible. 
