Changes in Temperature and Distribution of Magnetism. 275 
M 0 
Mi oo 
M' 0 
N 0 
Nioo 
Mo-Mi o o 
o 
i 
o 
S 
o 
o 
No N 100 
M 0 
M 0 
M 0 
N 0 
I. Hard steel bar. 
71.5 
41.5 
44.8 
37 . 
33.2 
0.420 
0.373 
0.483 
0.103 
134.5 
89.2 
96 . 
85.5 
77.8 
0.321 
0.286 
0.364 
0.090 
195 . 
134.3 
146.2 
133.3 
120 . 
0.311 
0.250 
0.316 
0.100 
II. Tempered steel bar. 
44 . 
27 . 
30 . 
29 . 
27 . 
0.386 
0.318 
0.341 
0.0690 
148.5 
107.2 
114.5 
110.3 
101 . 
0.278 
0.229 
0.257 
0.0814 
219.5 
165 . 
179 . 
172 . 
156 . 
0.249 
0.184 
0.216 
0.0930 
317 . 
239 . 
260.7 
251.2 
226 ... 
0.246 
0.178 
0.207 
0.1003 
Soft steel bar , No. 1. 
85 . 
45 . 
38 . 
33.2 
0.471 
0.553 
0.126 
141 . 
73.5 
68.5 
57 . 
0.479 
0.514 
0.168 
193 . 
99 . 
101 . 
78.5 
0.487 
0.478 
0.223 
209,5 
109.5 
115 . 
88.2 
0.477 
0.451 
0.233 
Soft steel bar, No. 2. 
95.5 
49.7 
54.2 
45 . 
39 . 
0.479 
0.432 
0.529 
0.133 
136.5 
73 . 
81.5 
69 . 
59 . 
0.465 
0.403 
0.495 
0.145 
174.8 
92.5 
108.3 
93.4 
76 . 
0.471 
0.378 
0.466 
0.186 
Very soft steel bar which had been heated and slowly cooled many times. 
51.5 
34.5 
37 . 
0.330 
0.282 
80.5 
54.5 
58 . 
0.323 
0.279 
113 . 
76 . 
82 . 
0.328 
0.274 
159.5 
103.3 
116.5 
0.353 
0.270 
181 . 
113.5 
131 . 
0.373 
0.277 
M 0 is the intensity of magnetization before any change in tempera¬ 
ture has taken place; M 100 , when first heated to 100° C.; M' 0 , after being 
again cooled to 0° C, N 0 and N 100 are the intensities of magnetiza¬ 
tion at the temperatures indicated by the subscripts after the magnet 
has been heated and cooled fifteen times. 
