ELECTRO METALLURGY.
Dissolve an ounce of sulphate of copper in a half pint of water; add a
few drops of sulphuric acid; connect with the zinc pole of the battery
the object to be coppered. To the wire connected with the carbon
attach a small plate of copper. Hang the object and the copper plate
in the solution a short distance apart. A deposit of copper will be
quickly formed.
THE HEATING EFFECT OF THE CURRENT.
With a piece of very fine platinum wire (No. 36 or 40), placed in the
circuit of the battery, the heating effect of the current may be
shown. A half inch of No. 36 platinum wire will serve for the
experiment. If the battery is in good condition it will heat from 1/8
to 1/4 inch of the wire red hot. This is sufficient to light gas or an
alcohol lamp, also to ignite powder or gun cotton.
A short piece of a watch hair spring, or a piece of very fine iron
wire, if placed in the circuit will be made very hot.
DUPLICATION OF BATTERIES.
Should the experimenter desire to go more deeply into the effects of
the current, he will need a more powerful battery. The battery
described has been made on a very simple plan, to enable the amateur
to copy it without difficulty or great expense.
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