208 Proceedings of the Royal Society of Edinburgh. [Sess. 
Table XIII. 
Field. 
Load in kilos, 
per sq. mm. 
Elongation for 
500 grams. 
1 
No. of 
Observations. 
M. 
28-5 
16-9 
*04815 cm. 
7 
21-28 xlO 11 
20*0 
•04808 
8 
21-31 
23*3 
•04810 
9 
21-30 
29-7 
•04828 
8 
21-22 
36-0 
•04847 
10 
21T4 
42-4 
•04863 
9 
21-07 
46-7 
•04870 
9 
21-04 
42*4 
•04855 
8 
21-10 
36-0 
•04835 
7 
21T9 
29-7 
•04810 
7 
21-30 
233 
•04801 
8 
21-34 
20-0 
•04810 
8 
21-30 
16*9 
•04815 
6 
21-28 
Table XIY. 
Field. 
Load in kilos, 
per sq. mm. 
Elongation for 
500 grams. 
No. of 
Observations. 
M. 
337 
16-9 
*04835 cm. 
8 
21T9 xlO 11 
20-0 
•04837 
8 
21T8 
233 
•04847 
8 
21T4 
29-7 
•04853 
10 
21T1 
36-0 
•04863 
10 
21-07 
42-4 
•04874 
8 
21-02 
46-7 
•04879 
8 
21-00 
42-4 
•04872 
9 
21-03 
36-0 
•04861 
8 
21-08 
297 
•04855 
9 
21T0 
233 
•04844 
9 
21T5 
20-0 
•04840 
8 
21T7 
16-9 
•04370 
6 
21 18 
Nickel. 
As already stated in the introductory part of this paper, nickel was 
subjected to experiment in the same way as iron and steel. The wire was 
first stretched for twenty-four hours with the greatest load that was to be 
put on it, and then the modulus determined at the temperature of the room 
before any current was passed. The wire was demagnetised by reversals 
to eliminate the residual effects of the stress, the current increased step by 
step until the temperature was above 150° C., and at each step the modulus 
was determined. It will be seen that the modulus with the current was 
