125 
Zinc, gold, and lead were instantly repelled on completing 
circuit; continued to be repelled, though in a somewhat 
less degree, whilst the circuit was continued; and were 
decidedly attracted when the circuit was broken. Silver, 
copper, cadmium, and tin were repelled on completing 
circuit, but one side of the disc touched the polar piece, 
the other side being repelled; and on breaking circuit the 
side of the disc which had been repelled was strongly 
attracted. Bismuth and antimony were strongly repelled 
from a single pole, but no decided attraction was apparent 
on breaking circuit; the motion not being distinguishable 
from the effect of gravitation, which caused the disc to 
swing towards the polar piece, after the force which repelled 
it had ceased. 
When the polar pieces are very close, that is, about 
0.25 to 0.1 apart, and the disc of metal is so suspended 
that one half of it is without, and the other half within, 
or between the polar pieces, another series of phenomena 
present themselves. If the metal be amongst those classed 
as magnetic, or be magnetically affected by the power 
employed, it is, of course, attracted, and clings to one or 
other of the polar pieces, after the first motion, to be 
hereafter noticed, has subsided. If the metal be dia-mag- 
netic it is repelled, and, in many instances, driven entirely 
out from between the polar pieces. At the instant of the 
completion of the voltaic circuit, the disc of metal moves 
transversely, as a pendulum, with a tendency to pass outwards 
from between the polar pieces; and on breaking circuit 
the disc moves transversely, but in the reverse direction, 
tending to pass within the polar pieces. Such motions are 
very remarkable, in that the direction of them is alike in 
all metals which do not become so strongly attracted by 
the magnetic influence as to cling firmly to one of the polar 
pieces. Thus they are exhibited in the same direction with 
VOL. III. i 
