100 Hare on the Galvanic Deflagrator. 
simultaneous exposure, after due repose, to the acid, va- 
rious modes suggested themselves of accomplishing this ob- 
ject. In the apparatus which I sent you, the coils, being 
all suspended to two beams, could be lowered into troughs 
containing the —— In another apparatus, of which I after- 
wards gave you an account, with an engraving for your 
Journal, the iroieehh containing the acid, were made to rise, 
so that all the plates might be immersed at once. A better 
mode has since occurred to me. ‘Two troughs are joined 
lengthwise, edge to edge, so that when the sides of the one 
are vertical, those of the other must be horizontal. Hence, 
by a partial revolution of the two troughs, thus united, upon 
pivots: which support them at at the ends, any fluid d which 
ma one trough, must flow into the other, and revers- 
ing the motion must flow back again. The Galvanic Se- 
ries being placed in one of the troughs the acid in the 
from it. The pivots are made of iron, coated with brass or 
copper, as less liable to oxidizement. A weulic’ communi- 
cation is made between the coating of the pivots, and the 
galvanic series within. In order to produce a connexion 
between one recipient of this description, and another, it is 
only necessary to allow a pivot of each trough to revolve on 
pieces of sheet copper, severally soldered to the different 
ends of a rod of metal. To connect with the termination of 
the series, the leaden rods, (to which are soldered the vices, 
or spring forceps, tor holding the substances to be exposed 
to the deflagrating power,) one end of each of the lead 
rods, is soldered to a piece of sheet copper. The pieces of 
copper, thus soldered to the lead rods, are then to be duly 
placed under the pivots, which are of course to be connect- 
ed with the terminations of the series, The last mentioned 
connexion is conveniently made by means of straps of cop- 
per, severally soldered to the pivots, and the poles of the 
series, _ screwed together by a hand=vice 
Fig. 1. pl. 5. represents an apparatus consisting of two 
troughs, each ten feet long, constructed in the manner 
which | have described, Each trough is deaigti6t to con- 
tain 150 galvanic pairs. The galvanic series in the uppet 
* For the plate see Vol. VII, No. 2, of this Journal. 
