722 
MR. FAIRBAIRN’S EXPERIMENTAL INQUIRY 
Experiment 6. 
Length between the nippers 24 inches. 
Distin- 
guishing 
mark. 
Stretch in 
2 feet. 
Breaking 
strain. 
Mean. 
Reduced at 
fracture. 
To else- 
where. 
Remarks. 
- 
in. 
tons. 
tons. 
in. 
in. 
C 1. 
6-00 
31-75 
— s 
1 
1-25 
- 
C 2 . 
6*62 
31-50 
1-06 B. 
F. 
C 3. 
C 4. 
6-12 
6-12 
32-50 
31-75 
>32-00 
1 
1 
>Mean of elongation 6-2 inches. 
C. 
6-00 
32-25 
1 
C. 
6-37 
32-25 
B. 
-- 
Experiment 7* 
Length between the nippers 10 inches. 
Distin- 
guishing 
mark. 
Stretch in 
10 inches. 
Breaking 
strain. 
Mean. 
Reduced at 
fracture. 
To else- 
where. 
Remarks. 
A. 
A. 
A. 
A. 
A. 
A. 
in. 
4-00 
3 - 87 
4 - 62 
4-75 
4-00 
4-12 
tons. 
32-25 
32 - 50 
30 - 50 
31 - 50 
33 - 25 
33-75 
tons. 
V 32-29 
in. 
1-06 
B. 
1 
in. 
1-25 
B. 
1-18 
1-25 
1 
>Meaii of elongation 4*2 inches. 
J 
Abstract of the foregoing. 
Length between 
the nippers. 
Breaking strain 
in tons. 
Mean elongation 
in inches. 
in. 
120 
32-21 
26 
42 
32-125 
9-8 
36 
32-35 
8-8 
24 
32-00 
6-2 
10 
32-29 
4-2 
As these experiments were made upon the same description of iron, it may be fairly 
inferred that the length of a bar does not in any way affect its strength. 
Reduction of the preceding Table. 
Length of bar. 
Elongation. 
Elongation per 
unit of length. 
in. 
120 
26 
-216 
42 
9-8 
-233 
36 
8-8 
-244 
24 
6-2 
-258 
10 
4-2 
-420 
