348 Hare on some Improved Forms 
again. The Galvanic Series being placed in one of the 
troughs, the acid in the other, by a movement such as 
above described, the plates may all be instantaneously sub- 
jected to the acid or relieved from it. The pivots are 
made of iron, coated with brass or copper, as less liable to 
oxidizement. A metallic communication 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 pl- 
vot of each trough to revolve on pieces of sheet copper, Se- 
verally 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, for hold- 
ing 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 connected with the terminations 
of the series. - The last mentioned connexion’ is conven- 
iently made by means of straps of copper, severally solder- 
ed to the pivots, and the poles of the series, and» screwed 
together by a hand vice. 
‘Fig. 1 pl 5; represents an apparatus, consisting of two 
troughs, each ten feet long, constructed inthe manner 
which I have described. Each trough is designed to con- 
tain 150 galvanic pairs. The galvanic series in the upper 
trough is situated as when not subjected to the acid. In the 
representation of the lower trough, the galvanic series 1 
mitted, in order that the interior may be better understood. 
The series belonging to this’ trough, may be observed be- 
ow it, in three boxes, each containing 50 pairs, fig. 2: In 
placing these boxes in the trough, some ‘space is left, be~ 
tween them and that side of the trough on which the acid 
enters, so that instead of flowing over them, it may "Um 
down outside, and rise up within them. 
The pairs of the series consist of copper cases, about 7 
inehes long, by 3 inches wide, and half an inch thick ; each 
containing a plate of zine, equidistant from its sides, a0 
prevented from touching it by grooved. strips of wood.— 
