50, in which, however, for the sake of economy of space, the
battery is placed on the working bench instead of on the floor. The
piece of wood is one inch square and three or four feet long. It is
perforated from front to back at distances of six inches by a number of
small holes, in which are inserted screws like that shown in fig. 51.
These are known as "terminals," and may be obtained of any electrician.
The head of each screw is soldered to the wire mentioned above as
running along the back and as being connected with the zinc end of the
battery. These terminals serve to fix the electrodes on which the copper
is to be deposited. The wire from the copper end of the battery is
similarly connected by a connecting screw (fig. 52) with another wire (H
in fig. 53), which runs along the top of the rod and has soldered to it,
at distances of six inches, cylindrical spirals of copper wire. These
should project from the rod at points about half-way between the
terminals already described. They may be made by wrapping copper wire
around a black-lead pencil for a length of about three inches.
[Illustration: FIG. 51.]
[Illustration: FIG. 52.]
[Illustration: FIG. 53.]
The rod is perforated from top to bottom with a series of small holes,
one in advance of each terminal but as near it as possible.
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