AND STRAIN ON THE ACTION OF PHYSICAL FORCES. 
49 
Experiment IV. 
The same wire as in the last experiment, which had been farther loaded and 
unloaded with 15 kilogs. until the recovery had become perfect for this load. 
Number of kilogs. 
in load. 
Temporary alteration 
of resistance. 
Average alteration 
per kilog. 
Difference between 
consecutive averages. 
1 
27'5 
27-50 
3 
83-0 
27-67 
•17 
5 
139-0 
27-80 
13 
7 
195-5 
27-93 
13 
9 
252-5 
28-06 
13 
11 
310-0 
28-18 
12 
13 
368-0 
28-31 
13 
15 
430-0 
28-67 
•36 
Experiment V. 
A piece of silver (1) annealed, which had been previously loaded and unloaded with 
8 kilogs. until the recovery had become perfect. 
Number of kilogs. 
in load. 
Temporary alteration 
of resistance. 
Average alteration 
per kilog. 
Difference between 
consecutive averages. 
2 
94 
47-00 
4 
189 
47-25 
•25 
6 
285 
47-50 
•25 
8 
383 
47-88 
■38 
Experiment VI. 
A piece ol platinum-silver (1) rendered very hard by drawing, and which had been 
loaded and unloaded several times with 20 kilogs. 
Number of kilogs. 
in load. 
Temporary alteration 
of resistance. 
Average alteration 
per kilog. 
Difference between 
consecutive averages. 
4 
79-00 
19-75 
8 
161-80 
20-23 
•48 
12 
246-25 
20-52 
•29 
16 
330-00 
20-63 
11 
MDCCCLXXXIII. 
H 
