38G 
IIR. C. CHREE OX THE EERECTS OF PRESSURE 
Index. 
(Numbers refer to paragraphs.) 
Apparatus, descriptiou of, 19. 
Barrett, Professor. Experiments on cobalt, 6. 
BinwELL, Mr. Shelfokd. Experiments on iron 
and cobalt, 5. 
Coefficient of induced magnetisation : 
Effects of pressure on, 40. 
Variation of, with streng-th of field, 39. 
Critical fields for effects of pressure on induced 
magnetisation of cobalt : 
Cyclic loading, 13, 14, 15, 45. 
First pressures, 17, 41. 
Critical fields for effects of pressure on residual 
magnetisation of cobalt, 18, 57. 
Critical fields for effect of tension on induced 
magnetisation of iron: 
Cyclic loading, 8, 9, 10. 
First tensions, 11. 
Cyclic effect of loading on induced magnetisation : 
In cobalt, 45, 46. 
In iron, 7, 8. 
In nickel, 9, 12. 
Cyclic effect of j^ressure on residual magnetisation : 
In cobalt, 18, 56, 57, 58. 
In iron, 8, 11. 
Demagnetisation, methods and possibility of, 
11 , 22 . 
Ewing, Professor. Experiments: 
On iron, 11, 69, 70. 
On nickel, 12. 
First pressure, effects of : 
On induced magnetisation of cobalt, 17, 30, 
41, 43. 
On residual magnetisation of cobalt, 18, 52, 
53, 64. 
First tension, effects of: on induced magnetisation 
of iron, 7, 8, 11. 
Heat: effects of, on magnetisation of cobalt, 
23, 30. 
Induced magnetisation ; 
Alteration of, by cycles of pressure, 40, 42. 
Mode of variation with sHength of field, 
39, 40. 
Intensity of magnetisation : variations of, through¬ 
out rods, 2, 8. 
Joule, Dr. Experiments on efl’ects of magnetisa¬ 
tion on length of iron rods, 3. 
Length of bars, effects of magnetisation on: 
In cobalt, 5, 6. 
In iron, 3, 4, 5. 
In nickel, 5. 
Mayer, Professor. Experiments on effects of 
magnetisation on length of iron rods, 4. 
Method of experiment, 20. 
Polar character of effects of pressure on induced 
magnetisation, 64-68. 
Preliminary outline of results of experiments, 
16,17, 18. 
Previous treatment of rod: effects of, on induced 
magnetisation, 28, 36, 37, 62, 63. 
Reduction of observations, 21. 
Resemblances betiveen phenomena in iron and 
cobalt, 69, 70. 
Residual effects of pressure cycles applied during 
fiow of current, 22, 42. 
Residual magnetisation : 
Effect on, of cycles of pressure during flow 
and break of current, 48. 
Effect on, of previous treatment of rod, 
22, 28, 33, 34. 
Mode of variation, with strength of previous 
field, 47. 
Percentage of, removed by pressure cycles, 
18, 59, 60. 
Residual susceptibility, 32, 49. 
Retentiveness : 
Defined, 50. 
Effect on, of pressure, during flow and break 
of current, 50. 
Variation of, with strength of field, 50, 
61. 
Reversal of sign of residual magnetisation by 
pressure, 22, 28, 65. 
Saturation: 
In induced magetisatiou, 39. 
In residual magnetisation, 18. 
Separation of effects of application, and existence 
of jmessure, 61, 62, 63. 
Shida, Mr. Experiments on iron, 10.. 
