452 
MR. HODGKINSON’S EXPERIMENTAL RESEARCHES 
Table XII. (Continued.) 
Description of Pillar. 
Length of 
pillar. 
Diameter 
of pillar. 
Mean dia- 
meter of 
pillar. 
Weight of 
pillar. 
Mean 
weight of 
pillar. 
Deflection. 
Weight 
causing the 
deflection. 
Breaking 
weight. 
Mean 
breaking 
weight. 
Remarks. 
1st. WROUGHT IRON. 
Solid uniform cylinder, "| 
one end rounded and 1 
a disc on the other. | 
Plate XV. No. 2, B. J 
Solid uniform cylinder, “| 
one end rounded and v 
a disc on the other. J 
ft. ins. 
2 6| 
2 6f 
inch. 
1-015 
1-015 
inch. 
jl-015 
lbs. oz. 
7 2 
lbs. oz. 
inch. 
lbs. 
lbs. 
22699 
19675 
lbs . 
.21187 
f Rounded and flattened by the 
L pressure. 
""The rounded endof this was tipt 
with hardened steel to prevent 
< crushing. The greatest de- 
flection was about 11 J inches 
from the rounded end. 
Solid uniform cylinder, "] 
rounded at one end 1 
and flat at the other, f 
Plate XV. No. 1, B. J 
Solid uniform cylinder, 1 
rounded at one end L- 
and flat at the other. J 
1 3§ 
1 3| 
1-005 
1-005 
\ 
.1-005 
3 5t 
3 5j 
| 3 5f 
28075 
24379 
1-26227 
" It became crushed at the 
rounded end, so that the flat- 
tened part was -55 inch (lia- 
<j meter. The greatest deflec- 
tion was about 7 inches from 
rounded end, or f inch from 
middle. 
J This had the rounded end 
\ tipt with hardened steel. 
Solid uniform cylinder, 1 
flat at hotli ends ... > 
Plate XV. No. 1, C. J 
7 6f 
1-02 
1-02 
20 6 
20 6 
•03 
•07 
•11 
■14 
•15 
•19 
•22 
•28 
•37 
•43 
324 
800 
1360 
1920 
2480 
3040 
3600 
4160 
4720 
5000 
5280 
5280 
Solid uniform cylinder, 1 
flat at both ends ... J 
5 0§ 
1-02 
1-02 
13 11 
13 11 
12990 
12990 
Solid uniform cylinder, 1 
flat at both ends ...J 
2 6i 
1-015 
1-015 
7 If 
7 n 
•05 
22027 
23371 
23371 
Solid uniform cylinder, "| 
with discat both ends. 
Plate XV. No. 2, C. J 
2 6} 
1-015 
1-015 
7 10| 
7 10f 
•03 
•04 
22027 
25387 
25387 
25387 
J It sunk with this weight after 
\ bearing it some minutes. 
Solid uniform cylinder,"! 
flat at both ends. 1- 
Plate XV. No. 1, C. J 
Solid uniform cylinder, ] 
flat at both ends ... J 
1 3§ 
1 3% 
1-005 
1-005 
1 1-005 
3 7i 
3 7i 
| 3 7\ 
27099 
27099 
j 27099 
2nd. CAST STEEL. NOT 
HARDENED. 
Solid uniform cylinder,"] 
rounded at both ends. > 
Plate XV. No. 1, A. J 
Solid uniform cylinder,"] 
one end rounded and 1 
the other flat. Plate [ 
XV. No. 1, B J 
Solid uniform cylinder, "] 
both ends flat. Plate > 
XV. No. 1,C J 
29-95 
29-95 
29-95 
•87 
•87 
•87 
5 2f 
5 3 
5 3§ 
•07 
•10 
■11 
18667 
22027 
25387 
10516 
20315 
26059 
10516 
20315 
26059 
f It bore this weight some mi- 
I notes, and then sunk gradu- 
] ally by bending; ends slightly 
[ flattened by pressure. 
[" Flattened a little at the rounded 
J end; greatest curvature be- 
1 tween § and f of the length 
[ from the rounded end. 
f It bore this five minutes, and 
then sunk : the ends were 
not split, as frequently liap- 
j pened, in a slight degree, both 
[ in cast and wrought iron. 
