174 A, M. Mayer—Effects of Magnetization 
magnetic to a various extent, the elongation will necessarily 
bear a greater proportion to the square of the magnetic intensity 
measured by the balance than would otherwise be the case. 
“For similar causes the interior of the bar will in general 
receive the neutralization and reversion of its polarity before 
the exterior, and hence we see in the tables that there 1s a con- 
siderable elongation of the bar after the reversion of the cur- 
rent, even when the effect upon the balance has become im- 
perceptible, owing to the opposite effects of the interior and ex- 
? 
terior magnetic particles. 
The next bar he experimented with was of moderately 
hardened steel. This bar wasslightly increased in length every 
time that contact with the battery was broken, although a con- 
siderable diminution of the magnetism of the bar took place 
at the same time. He says: “I am disposed to attribute this 
effect to the state of tension in the hardened steel, for I find 
that soft iron wire presents a similar anomaly when stretched 
tightly.” ; 
extremely hese ee that the shortening effects are proportional 
ceteris parr * ” 
1s equal, if not superior, to those of soft iron, when magnetize 
