13 
Remarks on the Tables and Curves . — From Diagram II. it is 
seen that the maximum value of the total magnetic induction 
is about 18000, and the maximum value of the permeability 
( = fj) is about 2950. In Table I. it is noticeable that ju, fif, 
B 
and ~ all come to a maximum for the same value of 
the magnetizing force, and this fact seems to be approximately 
true in most cases. If the method of demagnetization used 
was successful, the results in the two tables should correspond. 
Perhaps the easiest way of comparing the two tables is by 
drawing the curves having permeability as ordinate and 
induction as abcessa or induction as ordinate and magnetizijig 
force as abcessa. If this be done, it will be found that the 
two tables agree fairly well. The two curves attached to 
this paper have, therefore, been obtained from the com- 
bination of the results in the two tables. 
In Table II. a remarkable oscillation of the value of the 
permanent induction seems to take place when the iron is 
near its maximum of magnetism. The same phenomenon 
is noticeable in Rowland’s experiments on iron rings, as will 
be seen from two instances given below, though he seems 
to regard the fact as showing a diminution rather than an 
oscillation in the value of the permanent induction. 
Rowland’s Table I. Rowland’s Table V. 
B. 
B,. 
B. 
Bl^. 
8943 
6369 
7770 
5607 
10080 
6838 
9300 
6400 
12270 
7502 
10590 
7066 
12970 
7666 
13410 
7913 
13630 
7520 
14240 
7959 
14540 
7939 
14910 
8061 
15770 
8116 
15680 
7974 
16270 
7852 
16580 
8109 
16600 
7888 
16850 
8064 
