92 Mr Kemp’s Experiments on Galvanism. 
3. The following Experiment was performed, to show that a wire, 
Jorming an unbroken metallic circuit, between the opposite poles 
of a battery, may have either the negative or positive state in- 
duced upon any portion of it, by being made to form, at he: same 
time, the circuit of another galvanic battery. 
Two galvanic batteries, A B and C D, (Plate III. Fig. 2. + con- 
sisting each of thirty plates two inches square, were placed. parallel © 
to, and at a little distance from each other: the one, A B, had a 
continuous metallic communication of platina wire between its poles, 
bent as seen in the figure. 
Two glass siphons, E F and GH, were so placed between the 
batteries, as to receive the bent portions of the wire I K, into one 
of their limbs, F and G. The siphons were filled with an infusion 
of red cabbage, to which a small quantity of the sulphate of soda 
was added, and which indicates, by its change of colour, the dif- 
ferent electric states of the wire in connection with it ; the positive 
wire turning the infusion red, the negative, green. When the bat- 
tery AB was charged, the circuit beg then completed, the elee- 
tricity circulated along the wire from P the positive pole, to N the 
negative. In this instance, no change took place in the colour of 
the liquid in the siphon, the circuit being unbroken. 
The other battery, C D, was now filled, and platina wires were 
brought from its poles into the other limbs of the siphons, that 
coming from P, the positive pole, being terminated in the limb H 
of the siphon G H, and that from the negative, being terminated 
in the limb E of the other siphon E F. 
The electricity of the battery AB, circulated, as has been stated, 
from P its positive pole, to N the negative, along the unbroken cir- 
cult of the wire. The electricity of the battery C D, also circulated 
from P the positive pole, to N the negative, both. in the same di- 
rection. The wire coming from P, the positive pole of the battery 
CD, whose extremity was inserted into the limb H of the siphon 
G H, induced upon the unbroken wire in the other limb G of the 
siphon GH, through the medium of the liquid, the opposite or 
negative state, although it was, at the same time, conveying the posi- 
tive electricity of the battery AB. This fact was beautifully illus- 
trated by the change of colour that took place in the opposite limbs 
of the siphons, the colour of the infusion in the limb H. becoming 
red, while that in the limb G became green. 
In like manner, the wire coming from N, the. negative pole of 
the battery C D, the extremity of which was aa into the limb 
E of the siphon ‘E F, induced the positive state upon the bent part 
of the platina wire in the other limb of the syphon F, although it 
was, at the same time, conducting the negative electricity of the bat- 
tery AB. This was also shown by the liquid becoming green in 
the limb E, and red in the limb F. 
The continuous metallic wire, I K, was now cut, and its extre- 
mities were terminated in a third siphon, LM, indicated by dotted 
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