The electrodes of the two first elements are
represented as renewed in the cut, in order to show the arrangement of
the tubes.
[Illustration: ESTEVE'S AUTOMATIC PILE.]
_Dimensions._--The zinc, 2, has a superficies of 15x20 centimeters,
and is cut out of the ordinary commercial sheet metal. It may be
turned upside down when one end has become worn away, thus permitting
of its being entirely utilized. The negative electrode is formed of
four carbons, which have, each of them, a superficies of 8x21
centimeters. These four carbons are less fragile and are more easily
handled than two having the same surface. Their arrangement is shown
at the left of the figure. They are fixed to a strip of copper, a,
to which is soldered another strip, L, bent at right angles. There are
thus two pairs of carbon per element, and these are simply suspended
from a piece of wood, as shown in the figure. Upon this wooden holder
will be seen the two strips, LL, that are designed to be put in
contact with the zinc of the succeeding element by means of pinchers
that connect the electrodes with one another.
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