Maximum Magnetism of Iron, Steel, ete. 423 
ber and Maxwell* have obtained equations from the 
theory that the particles of a body are magnetic and merely 
turn round when the magnetizing force is applied which repre- 
sent these actions to some extent, but not so closely as might 
be desired. However it is probable that the theory might be 
so modified as to agree with experiment. 
a 
The second method of studying the tables is to plot them 
With the values of Q as abscissas and as ordinates. In this 
Way we obtain a curve which has some remarkable properties 
and which has the advantage over the other kind inasmuch as 
tis of finite dimensions and from it we can obtain the maxi- 
mum of magnetization easily by a simple measurement. In 
the figure 2 have given plots of tables I and V, the larger be- 
allel to the axis of Q and bisecting them we notice the strange 
i t that the center points always fall very exactly on a straight 
ne, which is therefore a diameter of the curve. All the sub- 
i. res which I have tried, steel, iron and nickel, obey this law, 
Fi T hope soon to make it general by experiments on cobalt. 
onthe obtained an empirical equation to express this curve, 
ch is of the form 
bu+tH 
Mo cin( PEE), 
i ; : 
toh: B, H, D, and 4, are constants depending on the kin 
quality of the metal used. B is the maximum value of 
* Treatise on Electricity and Magnetism, Arts. 4434-5. 
