W. A. Norton on Molecular Physics. 69 
upon the obliquity of the direction of the motion to these lines. 
id i aced over the middle of the magnet, (mm, 
fig. 9), and moved in an 
direction from this position, 
across the lines of force as 
running in the same direc- 
ion as the circular currents 
on the upper side of the mag- 
net; and if the wire be mov- 
ed across these lines toward 
the middle of the magnet, a 
current will traverse the wire 
in the opposite direction. In 
each case the comparative quantity of electricity set in motion, 
will depend solely upon the comparative number of magnetic 
curves crossed, and not upon the line, mr, ms, or mt, along which 
the movement takes place. 
? 
length. This is strikingly true of the curves that originate from 
near the center of each end; for at the very center, the force in 
question vanishes entirely, and therefore the curves for that 
in be thrown to an infinite distance from the middle 
of the magnet. 
In making a comparative estimate of the impulsive force of 
the magnet in different parts of the field, it should ‘be observed 
that in receding from the magnet the force that results from any 
propagated from the o itely directed currents on the nearer 
oo fot af and that this not only depends 
_ the distance of the point from the molecule, but also upon 
> obliquity of the line connecting 
