Associated cases of Current and Static Effects. 87 
certain, these instruments were changed one for the other, but 
the deviations were still alike; so that the two wires conducted 
with equal facility. 
The canse of the first results is, upon consideration, evident 
enough. In consequence of the perfection of the workmanship, 
a Leyden arrangement is produced upon a large scale; the cop- 
per wire becomes charged statically with that electricity which 
the pole of the battery connected with it can supply ;* it acts by 
induction through the gutta percha (without which induction it 
could not itself become charged, Exp. Res. 1177), producing the 
Opposite state on the surface of the water touching the gutta per- 
cha, which forms the outer coating of this curious arrangement. 
The gutta percha across which the induction oceurs is only 0-1 
of an inch thick, and the extent of the coating is enormous. 
The surface of the copper wire is nearly 8300 square feet, and 
the surface of the outer coating of water is four times that 
amount, or 33,000 square feet ; hence the striking character of the 
tesults. The intensity of the static charge acquired is only eqnal 
‘othe intensity at the pole of the battery whence it is derived ; 
but its quantity is enormous, because of the immense extent of 
the Leyden arrangement; and hence when the wire is separated 
ftom the battery and the charge employed, it has all the powers 
of a considerable voltaic current, and gives results which the best 
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