202 Dr. Hare’s Galvanic Deflagrator. 
fore effected by the same surface of metal, arranged in the 
same number of combinations. This will appear the more’ 
remarkable, when it is remembered that your apparatus pro- 
duces these effects without insulation. Although through 
your civility I have just received the glass jars by which 
you insulate your coils, I have not yet been able to use 
them, and can therefore speak only of the results obtained 
without them. 
With your eighty coils of fourteen inches by six, for 
the copper, and of nine by six for the zinc, I obtained ef- 
fects which, as to every thing that related to intense heat 
and light, and brilliant combustion, far surpassed the powers 
of a battery of the common form of six hundred and twenty 
pairs of plates—one hundred and fifty pairs of which, of six 
inches square, are insulated by glass partitions—one hun- 
dred pairs of the same size, and three hundred of four inches 
square, are insulated by resin, and the rest, either by Wedg- 
wood’s ware or by resin, making in the whole a battery 
with a surface of thirty-six thousand eight hundred and 
eighty square inches. Your’s has a surface of only 
twenty-two thousand and eighty square inches, but even with- 
out insulation it isincomparably more powerfulthan the other 
with that advantage. ‘This is the most singular circumstance 
connected with your new apparatus, and which goes far to 
shake our previous theoretical opinions, if not to rel sre 
your own. 
I repeated every important experiment ined in your 
memoir, and with results so similar, that it is scarcely neces= 
sary to relate them. ‘The combustion of the metals was 
brilliant beyond every thing which I had witnessed before, 
and the ignition of the charcoal points was so intense, as 
to equal the brilliancy of the sun; the light was perfectly 
intolerable to eyes of only common strength. If 1 were to 
name any metallic substance which burned with more than 
common energy, it would bea common brass pin, which, 
when held in the forceps of one pole, and touched to the 
chareoal point on the other, was consumed with such ener- _ 
gy, that it might be said literally to vanish in flame. 
The light produced between the charcoal points when im- 
mersed beneath acids, oils, alcohol, ether, water, &c. was 
very intense, and platina melted in air as readily as wax in 
the blaze ofa candle. Jt is a very great advantage of your 
