150 MR. FARADAY’S EXPERIMENTAL RESEARCHES IN ELECTRICITY. 
sity, but gradually diminished in force from that place. It appeared to be 
equally powerful at equal distances from the place of the magnetic poles, not 
being affected in that respect by the direction of the rotation. When the 
rotation of the disc was reversed, the direction of the current of electricity was 
reversed also ; but the other circumstances were not affected. 
93. On raising the plate, so that the magnetic poles were entirely hidden 
from each other by its intervention, (a. fig. 10,) the same effects were produced 
in the same order, and with equal intensity as before. On raising it still 
higher, so as to bring the place of the poles to c, still the effects were pro- 
duced, and apparently with as much power as at first. 
94. When the conductor was held against the edge as if fixed to it, and with 
it moved between the poles, even though but for a few degrees, the galvano- 
meter needle moved and indicated a current of electricity, the same as that 
which would have been produced if the wheel had revolved in the same 
direction, the conductor remaining stationary. 
95. When the galvanometer connexion with the axis was broken, and its 
wires made fast to two conductors, both applied to the edge of the copper disc, 
then currents of electricity were produced, presenting more complicated ap- 
pearances, but in perfect harmony with the above results. Thus, if applied as 
in fig. 11, a current of electricity through the galvanometer was produced; but 
if their place was a little shifted, as in fig. 12, a current in the contrary direction 
resulted; the fact being, that in the first instance the galvanometer indicated 
the difference between a strong current through A and a weak one through B, 
and in the second, of a weak current through A and a strong one through B 
(92.), and therefore produced opposite deflections. 
96. So also when the two conductors were equidistant from the magnetic 
poles, as in fig. 13, no current at the galvanometer was perceived, whichever 
way the disc was rotated, beyond what was momentarily produced by irre- 
gularity of contact ; because equal currents in the same direction tended to 
pass into both. But when the two conductors were connected with one wire, 
and the axis with the other wire, (fig. 1 4,) then the galvanometer showed a cur- 
rent according with the direction of rotation (91.) ; both conductors now act- 
ing consentaneously, and as a single conductor did before (88.). 
97. All these effects could be obtained when only one of the poles of the 
