ON THE MEASUREMENT OF MAGNETIC HYSTERESIS. 
79 
The magnetic force was put through about 20 cycles of reversal before the tests for 
Bq and W were made. The results are given in the following table, and the curve 
representing them is shown in fig. 10 ; the curves (1) to (5) are considered in § 65. 
H„. 
Bo. 
W. 
Ho. 
Bo. 
ji. 
W. 
18-75 
15800 
843 
19400 
8-0 
11880 
1485 
10720 
15-0 
15190 
1012 
17720 
6-0 
9490 
1582 
7530 
12-0 
14350 
1196 
15580 
4-0 
5660 
1415 
3424 
10-0 
13380 
1338 
13550 
3-0 
2990 
997 
1170 
Effect of Torsion within the Elastic Limit. 
§ 58. The wire was found capable of sustaining 300 grammes hung from the edge 
of the wheel without acquiring permanent set. We therefore decided to subject it to 
