Oisr THE MAGNETISATION OF COBALT. 
387 
Shock-effect: 
In induced magnetisation, 7, 8, 17, 43. 
In residual, 53, 54, 55. 
Tables : I. and II., 24; III. and lY., 29; Y., 32 ; 
YI, YII., YIII., 34; IX., X., 35; XI., 70. 
Theory and experiment: comparison of, 14, 15. 
Thomson, Professor, J. J. Theoretical deductions, 
13. 
Thomson, Sir W. Experiments on iron and 
nickel, 9. 
Yillari. Expei'iments on iron, 8. 
Yillabi critical point: 
Defined, 11. 
Experimentally determined, 15, 45. 
Theoretically considered, 13. 
Index for Figures (Plates 15, IG). 
Plate 15, figs. 1-8 ; Plate IG, Figs. 9-15. 
Number of 
figure. 
Quantities represented. 
Tables, data 
taken from 
Paragraphs in 
which figures 
discussed. 
1 
Amount of induced magnetisation. 
III., TX. 
39 
2 
Effects of pressure on amount of induced magnetisation 
IX. 
40 
3 
Coefficient of induced magnetisation. 
III., IX. 
39 
4 
Effects of pressure on coefficient of induced magnetisation 
IX. 
40 
5 
Effect of first pressure on induced magnetisation, and loss 
of induced magnetisation during removal and reintro¬ 
duction of rod after pressure cycles 
IX. 
41, 42 
6 
Relative importance of shock-effect of first pressure on 
induced magnetisation 
X. 
43 
7 
Cyclic effect of pressure on induced magnetisation . 
I., III., X. 
45 
8 
Relative importance of cyclic effect of pressure on induced 
magnetisation 
III., X. 
46 
9 and 10 
Amount of residual magnetisation under various conditions 
as to pi’essure 
Y.-YIII. 
47, 48 
11 
Residual susceptibility. 
Y.-YIII. 
49 
12 
Retentiveness. 
YI.-X. 
50 
13 
Retentiveness, and fraction of residual magnetisation 
removed by pressure cycles 
YI., IX. 
51, 59, 60 
14 
Effect of first alteration of stress following break of current 
YI.-YTII. 
52 
15 
Ratio of “ shock-effect ” of first alteration of stress after 
break of current to previous residual magnetisation 
YI.-YIII. 
54, 55 
3 D 2 
