Jars
are set in a row in some convenient place out of the way.
Next cut out eight copper or brass disks, two for each jar. Their
size also depends on the voltage. The disks that are placed in the
lower part of the jars are connected with a rubber covered wire
extending a little above the top of the jar.
To wire the apparatus, refer to the sketch and you will see that
jar No. 1 is connected to point No. 1 on switch; No. 2, on No. 2,
and so on until all is complete and we have one remaining point on
switch. Above the jars place a wire to suspend the other or top
disks in the solution. This wire is also connected to one terminal
on the motor and to remaining point on switch. The arm of the
switch is connected to one terminal of battery, or source of
current, and the other terminal connected direct to remaining
terminal of motor.
Put arm of switch on point No. 1 and lower one of the top disks in
jar No. 1 and make contact with wire above jars. The current then
will flow through the motor. The speed for each point can be
determined by lowering top disks in jars. The top disk in jar No.
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