The accompanying cut represents a battery of 6 elements, with a
reservoir, R, for the liquid, provided at its lower part with a cock
for allowing the liquid to enter the pile. The vessels of the
different elements are of rectangular form. At the upper part, and in
the wider surfaces of each, there are two tubes. The first tube of the
first vessel receives the extremity of a safety-tube, A, whose other
extremity enters the upper part of the reservoir, R. This tube is
designed for regulating the flow of the liquid into the pile. When the
cock, r, is too widely open, the liquid might have a tendency to
flow over the edges of the vessel; but this would close the orifice of
the tube, A, and, as the air would then no longer enter the reservoir,
R, the flow would be stopped automatically. The second tube of the
first vessel is connected with a lead tube, 1, one of the extremities
of which enters the second vessel. The other tubes are arranged in the
same way in the other vessels. The renewal of the liquids is effected
by displacement, in flowing upward from one element over into another;
and the liquids make their exit from the pile at D, after having
served six times.
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