INTO THE STRENGTH OF WROUGHT-IRON PLATES. 
721 
elongation of l‘2o inch in 36 inches length of bar, giving an elongation per unit of 
1*25 
weight and length •0154 ; that is, the elongation in this latter case is about 
three times that in the former. 
Experiments made to ascertain whether a shorter bar of iron is stronger than a 
longer one of the same kind and size, Ifths of an inch diameter, SC ^7^. 
Experiment 3. 
Length between the nippers 10 feet. 
Distin- 
guishing 
mark. 
Stretch 
in 10 feet. 
Breaking 
strain. 
Mean. 
Reduced at 
fracture. 
To else- 
where. 
Remarks. 
in. 
tons. 
tons. 
in. 
in. 
1. 
26*00 
33*00 
1 
1*25 
1 
2. 
26*75 
31*75 
1*18 
3. 
4. 
26*25 
23*00 
32*25 
32*00 
>32*21 
1*25 
!>]VIean of elongation 26 inches. 
5. 
27-50 
32*25 
B. 
B. 
6. 
26*75 
32 00 
1*06 
Experiment 4. 
Length betw'een the nippers 42 inches. 
Distin- 
guishing 
mark. 
Stretch in 
42 inches. 
Breaking 
strain. 
Mean. 
Reduced at 
fracture. 
To else- 
where. 
Remarks. 
B. 
B. 
B. 
B. 
B. 
B. 
in. 
9-50 
9-37 
10*25 
10*37 
8*62 
8*87 
tons. 
32*50 
33*00 
31*75 
31*50 
32*00 
32*00 
tons. 
[>32*125 
in. 
1*06 
B. 
1 
1*06 
F. 
in. 
1-25 
B. 
B. 
F. 
F. 
1 
I 
I 
)*Mean of elongation 9*8 inches. 
I 
J 
Experiment 5. 
Length between the nippers 36 inches. 
Distin- 
guishing 
mark. 
Stretch in 
36 inches. 
Breaking 
strain. 
Mean. 
Reduced at 
fracture. 
To else- 
where. 
Remarks. 
in. 
tons. 
tons. 
in. 
in. 
A. 
8*50 
32*25 
1*06 
1*25 
A. 
8*75 
32*25 
1 
B. 
1 
A. 
A. 
9-00 
9-12 
31*25 
31 *50 
>32*25 
F. 
B. 
^Mean of elongation 8‘8 inches. 
1 
A. 
9-37 
33*50 
B. 
B. 
1 
A. 
8*87 
33*25 
J 
B. 
B. 
j 
4 z 
MDCCCL. 
