22 
MR. H. TOMLINSON ON THE INFLUENCE OF STRESS 
Table I. (continued)—Number of complete turns of permanent torsion produced 
before the application of the load —n. Temporary alteration of torsion produced 
by the load in terms of divisions of the scale =a ; -f- signifies further twist, 
• . ^ 
— untwist on loading. 
TO. 
Iron, a piece of the same hank as 
that used in a, but heated to a 
bright red and suddenly cooled. 
n. 
Copper, a piece of the sam e wire 
as used in l. 
0. 
Iron, a piece of the same wire as 
that used in a, bnt elongated 
10 per cent. 
n. 
1c. 
a. 
n . 
k. 
a. 
n. 
k. 
a 
5 mins. 
5 mins. 
5 mins. 
0 
0 
0 
20 
10 
76 + 
140 
6 
103-5 + 
10 
6 
12-2 + 
120 
10 
160 + 
240 
6 
50-0 + 
340 
6 
38-0- 
24 hrs. 
10 turns of torsion in the 
10 
other direction. 
w hr. 
"11 
10 
6 
17-0+ 
5 mins. 
340 
6 
102-5- 
3 days. 
0 
0 
Heated to redness by passing 
2 
16 + 
a burner several times 
30 
6 
18-0 + 
10 
62 + 
up and down. 
12 hrs. 
5 mins. 
0 
wire 
cool. 
0 
70 
6 
7-5 + 
340 
6 • 
50-0- 
10 
•8 + 
390 
6 
55-5- 
2 days. 
12 
90 
8 
7-0- 
12 
7-0- 
Explanation of and remarks on Table I. 
The times given in the various columns represent approximately the intervals 
between the imparting of the permanent torsion and the testing with the loads, whilst 
the numbers below the times are the number of kiloys. with which the wire was 
* 5 nuns 
weighted during these intervals ; thus () ’ means that the wire remained unloaded 
for five minutes after the permanent torsion had been applied, and that the 
wire was tested 16 hours after the torsion, having in the meantime sustained a 
load of 12 kilogs. By unloaded we must understand that the scale-pan weighing 
2 kilogs. remained on the wire, except in the cases of lead and tin, when a weight of 
'05 kilog. was substituted for that of the pan. 
