Hare’s New Galvanic Apparatus, Theory, &c. 109 
- Thad accordingly a trough constructed with a partition 
aaity the middle, so as to receive forty coils on one side, 
and a like number on the other. This apparatus when in 
operation excited a sensation scarcely tolerable in the backs 
of the hands. Interposed charcoal was not ignited as-easily 
as before; but a most intense ignition took place on bring- 
ing a metallic point connected with one pole of the series, 
into contact with a piece of charcoal fastened to the other. 
{t did not take place however so speedily as when glasses 
were used; but soon after the ignition was effected it be- 
came even more powerful than before. A cylinder of pla- 
tina nearly a quarter of an inch in reese at tapering a little 
at the end, was fused an d burned. so as to sparkle to a con- 
of about half an inch diameter was seen to burn on evans 
face with a green flame. Tin foil, or tinsel rolled up into 
large coils of about three quarters of an inch thick were 
rapidly destroyed, as was a wire of platina of No. 16. Pla- 
tina wires in connexion with the poles were brought into 
contact with ‘sulphuric acid; there was an appearance 
of lively ignition, but strongest on the positive side. Ex- 
cepting inits power of permeating charcoal, the galvanic fluid 
seemed to be extricated with as much force, as when each 
coil was ina. distinct glass. -Apprehending that the partition 
in the trough did not sufficiently insulate the ent from each 
other, as they were but a few inches apart, m or 
moistened wood intervening, I had two troughs each to hold 
pairs, and took care that there should be a dry space. 
about fontt inches broad between them. ‘They were first 
filled with pure river water, there being no saline nor acid 
matter to influence the plates, unless the very minute quan- 
tity which might have remained on sine from former im- 
mersions. Yet the sensation produced by them, on ‘the 
backs of ny hands, was painful ; and a lively scintillation 
took place when the poles were approximated. “Datch 
gold leaf was not sensibly burned, though water was found 
decomposible ‘by wires properly affixed. - _— effect was 
produced on potash, the heat being inadequate to fuse it. 
_ A mixture of nitre and sulphuric acid: was next added to 
the water in the troughs, afterwards charcoal from the fire 
‘was vividly ignited, ate when attached to the positive pole 
a-stee! wire was interposed: between it and the other pole, 
