86 Prof. Faraday on Electric Induction— 
shocks from one charge of the wire. If time were allowed to 
intervene between the charge and discharge of the wire, the 
shock was less; but it was sensible after two, three, or four min- 
utes, or even a longer period. be 
hen, after the wire had been in contact with the battery, it 
was placed in contact with a Statham’s fuse, it ignited the fuse 
(or even six fuses in succession ) vividly; it could unite the fuse 
three or four seconds after separation from the battery. When, 
having been in contact with the battery, it was separated and 
laced in contact with a galvanometer, it affected the instrument 
very powerfully ; it acted on it, though less powerfully, after the 
lapse of four or five minutes, and even affected it sensibly twenty 
or thirty minutes after it had been separated from the battery. 
When the insulated galvanometer was permanently attached to 
the end of the water wire, and the battery pole was brought in 
contact with the free end of the instrument, it was most instruct 
ive to see the great rush of electricity into the wire; yet after 
that was over, though the contact was continued, the deflection 
was not more than 5°, so high was the insulation. Then sep 
rating the battery from the galvanometer, and touching the latter 
with the earth wire, it was just as striking to see the electricity 
rush out of the wire, holding for a time the magnet of the instrtr 
ment in the reverse direction to that due to the ingress or charge. 
These effects were produced equally well with either pole © 
the battery or with either end of the wire; and whether the 
electric condition was conferred and withdrawn at the same end, 
or at the opposite ends of the 100 miles, made no difference 
the results. An intensity battery was required, for reasons wh 
will be very evident in the sequel. That employed was able 1 
decompose only a very small quantity of water in a given time. 
A Grove’s battery of eight or ten pairs of plates, which w 
have far surpassed it in this respect, would have had scarcely # 
sensible power in affecting the wire. é 
When the 100 miles of wire in the air were experimented with 
in like manner, not the slightest signs of any of these effects 
d 
equally good conductor. This point was ascertained by attacl- 
he 
ing the end of the water wire to one galvanometer, and the end 
