ON THE STEENGTH OF PILLAES OF CAST lEON. 
885 
Table V. — Solid Pillars cut out of the 10-feet pillars, 2^ inches diameter, previously 
experimented on, and now made 6 feet 3 inches long, quite straight, and with their 
ends turned flat and perpendicular to the axis, the irons being obtained from various 
parts of the United Kmgdom (Table III.). 
No. of Kx- 
peiiment. 
i 
Description of Pillar, 6 feet 
3 inches long, and as above. 
Weights 
laid on. 
Decrement. 
Deflection. 
Breaking weight, or that 
with which the pillar sank. 
Remarks. 
i i 
lbs. 
inch. 
inch. 
1 . 
Derwent Iron, No. 1. 
20693 
-024 
The pillar broke where it had been beaten 
Durham. Hot blast. 
30101 
-043 
with a hammer to straighten it after 
i 
From E-xp. 3, Table III. 
39509 
•062 
the former experiment, by which its 
i 
Diameter 2-529 inches. 
48917 
•082 
•02 
strength was probably reduced. The 
I 
1 
58325 
•100 
situation of the neutral line in this and 
; 
67733 
•119 
the following e.xperiment is strongly 
1 
77141 
•137 
•10 
marked. The pillar broke at the mid- 
86549 
•158 
die, and was cracked at each end. See 
95957 
•177 
Plate XXXIII. 
105365 
•202 
•32 
1 
112438 
•221* 
112438 lbs.=50’20tons. 
2. 
London Mixture. 
33881 
•085 
The pillar cracked at both ends, and 
; 
One-half old plate iron, 
43289 
•105 
broke in the middle. 
i 
and one-half Calder iron. 
52697 
•124 
•10 
For form of fracture see Plate XXXIII. 
I 
62105 
•142 
From Exp. 9, Table III. 
71513 
•161 
Diameter 2-533 inches. 
80921 
•181 
•12 
90329 
•200 
99737 
•218 
•18 
104441 
•232 
•27 
109145 
•247 
•32 
113849 
•274 
•52 
114320 
•277* 
114320 lbs. =51-04 tons. 
3. 
Level Iron, No. 1. 
33881 
•085 
It broke into a number of pieces. See 
Staffordshire. Hot blast. 
43289 
•103 
6gure, Plate as above. 
From Exp. 11, Table III. 
52697 
•123 
Diameter 2-5 18 inches. 
62105 
•142 
71513 
•161 
80.921 
•179 
90329 
•186 
99737 
•213 
109145 
•232 
118553 
•252 
129137 
•269 
131275 
•272* 
131275 lbs.=58-60tons. 
4. 
Old Hill Iron, No. 1. 
20693 
•065 
The pillar broke across in the middle. 
Staffordshire. Cold blast. 
33881 
•103 
and cracked at both ends. See form 
From Exp. 20, Table HI. 
43289 
•122 
•03 
of fracture, Plate as above. 
Diameter 2-523 inches. 
52697 
•146 
62105 
•164 
71513 
•188 
80921 
•214 
•22 
85625 
•230 
•28 
90329 
•250 
•41 
93622 
•264* 
93622 lbs. = 4 1 -79 tons. 
5. 
Second London Mixture. 
33881 
•008 
Broke by splitting in the middle and at 
About two-thirds of old 
43289 
•086 
the ends, one being broken off. See 
metal, and one-third of 
52697 
•102 
Plate as above. 
best Scotch pig-iron. 
62105 
•117 
From Exp. 21, Table III. 
71513 
•133 
1 
Diameter 2-5 1 1 inches. 
80921 
•149 
1 
90329 
•164 
i 
99737 
•181 
109145 
•197 
•04 
j 
118553 
•218 
•14 
1 
123601 
•233 
•26 
1 
127432 
•244* 
127432 lbs.=56-89ton3. 
1 
5 z 
MDCCCLVII. 
