AND STRAIN ON THE ACTION OE PHYSICAL EORCES. 
7 
Experiment II. 
The same wire having been elongated by traction to the extent of 29‘4 centims. 
was again tried with the same weights immediately afterwards. 
No. of kilogs. on pan. 
Reading of scale. 
Alteration of length. 
Mean values. 
8 
2110 
0 
3-58 
-17-52 
1 
8 
21-10 
+ 17-52 
} 17-52 
0 
3-58 
-17-52 
1 
4 
0 
12-08 
3-58 
+ 8-50 
- 8-50 
1 
J 
- 8-50 
12 
31T0 
+ 27-52 
1 
26-90 
0 
4-20 
-26-90 
J 
The scale-pan was now removed for 1 minute and then put on again. 
12 
30-10 
0 
3-12 
-26-98 
26-98 
8 
0 
20-50 
315 
+ 17-38 
-17-35 
1 
17-37 
4 
11-60 
+ 8-45 
• 8-45 
Taking only the last trials we see that, now, the first 4 kilogs. produce an alteration 
of 8'45, the second of 8'92, and the third of 9'61. 
Experiment III. 
The wire was still further lengthened by 11*8 centims. and the pan being on the 
reading of the scale was 3‘40. The pan was then removed for one minute, and after¬ 
wards replaced, scale now 2*40. Again the pan was removed for 30 minutes, and 
replaced, scale 2'18. The trials were then renewed with the same weights as those 
used in the other experiments. 
No. of kilogs. on pan. 
Reading of scale. 
Alteration of length. 
Mean values.* 
0 
2-18 
4 
10-80 
+ 8-62 
' 
8-48 
0 
2-32 
- 8-48 
8 
20-30 
+ 17-98 
17-65 
0 
2-65 
-17-65 
12 
30-90 
+ 28-25 
27-50 
0 
3-40 
-27-50 
J 
4 
11-90 
+ 8-50 
8-50 
8 
2100 
+ 17-60 
1 
17-50 
0 
3-50 
-17-50 
J 
12 
30-90 
+ 27-40 
27-30 
0 
3-60 
-27-30 
J 
Taking the results of the last observations we obtain for the first 4 kilogs. an 
alteration of 8'50, for the second four 9'00, and for the third 9’80. 
* In this and the following tables the — numbers only are taken, because it was always found that 
after the wire had been entirely relieved from stress a small sub-permanent set was produced by each of 
the weights when put on for the first time after such a release. 
