ON THE STRENGTH OF PILLARS OP CAST IRON. 
I 
1 
I 
Strength of Pillars of Low Moor Iron, No. 3, and of other Materials, with the 
pillars in the present research. 
with flat ends, and sometimes with discs to give them a larger bearing at the ends. 
Ratio of the strengths 
1 
of pillars with both 
B 
Number of 
Weight which 
ends rounded and with 
Diameter of section. 
experiments 
Breaking weight 
would crush 
both flat, the diameters 
C’ 
deduced 
(B). 
the specimen 
being considered equal. 
from. 
(C). 
lbs. 
External diameter 
1-78 in. 
17840 lbs., 
Internal diameter 
1 1-21 in. 
1 
or 17177 lbs. 
for length 
146975 
1 : 3*075 
*1237 
Area of section 
90f in. 
1'339 sq. in. 
.2 
External diameter 
to 
1*74 in. 
16705 lbs., 
0 rn 
Internal diameter 
M87in. 
1 
or 16084' lbs. 
for length 
-G S 
« 2 
.5 GO 
139584 
1 : 2*816 
t>. 
0 
*115 
Area of section 
90f in. 
0 
1*2712 sq. in. 
Is? 
^ II ^ 
>-i 
External diameter 
2*01 in. 
28353 lbs.. 
a 
Internal diameter 
1*415 in. 
1 
or 27299 lbs. 
for length 
175742 
1 : 3*266 
a 
<v 
§ 
*155 
Area of section 
9 OJ in. 
1*6005 sq. in. 
External diameter 
73 
u 
2*23 in. 
40569 lbs.. 
0 
Internal diameter 
1*54 in. 
1 
or 39061 lbs. 
for length 
224330 
1 : 3*153 
*174 
Area of section 
90| in. 
2*0431 sq. in. 
- 
External diameter 
r 
3*555 in. 
"o 
Internal diameter 
2*693 in. 
1 
114479 lbs. 
=51*11 tons. 
JO 
405774 
1 : 2*629 
*282 
Area of section 
4*230 sq. in. 
CO 
i- ^ 
:S II ^ 
External diameter 
•272 
3*532 in. 
Internal diameter 
2*659 in. 
1 
110649 lbs. 
^ CO 
^ GO 
beg 
407203 
1 : 2*408 
This pillar had 
been split at 
one end in the 
Area of section 
4*245 sq. in. 
= 49*39 tons. 
.5 S" 
G 
first experi- 
ment, and was 
Weight of pillar 
130 lbs. 
Diameter 1*02 
1 
5280 
0 
1 ; 2*920 ' 
hooped. 
0 
Diameter 1*02 
1 
12990 
1 : 3*298 
>_o 
a 
Side of square 
4 
9625 
1 : 3*011 
a 
1*75 in. 
