ON THE STEENG-TH OF PILLAES OP CAST lEON 
883 
Table IV. — Solid Pillars cut out of the 10 feet pillars, 2^ inches diameter, previously 
experimented upon, and now made 7 feet 6 inches long, quite straight, and with 
their ends turned flat and perpendicnlar to the axis, the iron being obtained from 
various parts of the United Kingdom (Tables III. and II.). 
No. of Ex- 
periment. 
Description of Pillar, 7 feet 6 inches 
long, and as above. 
Weights 
laid on. 
Decre- 
ment. 
Deflec- 
tion. 
Breaking weight, 
or that with which the pillar 
sank. 
Remarks. 
lbs. 
inch. 
inch. 
Broke into four pieces. 
1 . 
Old Park Iron, No. 1. 
20693 
•058 
Stourbridge. Cold blast. 
30101 
•078 
Cut out of the pillar in Table III. 
39509 
•098 
Exp. 2. 
48917 
•118 
Diameter 2-526 inches. 
58325 
•138 
67733 
•157 
•10 
77141 
•176 
•17 
86549 
•196 
•25 
91253 
•207 
•32 
95957 
•221 
•44 
100191 
•234* 
•55* 
100191 lbs. =44-73 tons. 
2. 
Old Park Iron, No. 1. 
20693 
•059 
•02 
The low result of the breaking 
From Exp. I, Table III. 
30101 
•078 
weight in this experiment ren- 
Diameter 2-503 inches. 
39509 
•096 
•05 
ders it probable that the pillar 
48917 
•113 
•08 
had sustained some injury by 
58325 
-132 
•12 
straightening after the former 
67733 
•151 
•15 
experiment. 
77141 
•171 
•23 
This pillar broke in three pieces of 
86549 
•195 
•36 
nearly equal length, splitting at 
91253 
•209 
•47 
one end. See Plate XXXIII. 
95487 
•222* 
•57* 
95487 lbs. =42-63 tons. 
3. 
Derwent Iron, No. 1. 
20693 
•059 
Durham. Hot blast. 
30101 
•076 
From Exp. 4, Table III. 
39509 
•094 
•02 
Diameter 2-517 inches. 
4S917 
•112 
58325 
•129 
•04 
67733 
•146 
•06 
77141 
•165 
•10 
86549 
•182 
•15 
95957 
•205 
•29 
100661 
•215 
•40 
105365 
•225* 
•51* 
105365 lbs. =47-04 tons. 
4. 
Portland Iron, No. I. 
20693 
•059 
Tovine, Scotland. Hot blast. 
30101 
•077 
From E.xp 6 Table III. 
39509 
•095 
Diameter 2-527 inches. 
48917 
•112 
•06 
58325 
•131 
•08 
67733 
•149 
•10 
77141 
•168 
•14 
86549 
•188 
•19 
95957 
•210 
•33 
100661 
•235 
•45 to -59 
102543 
•245* 
•69* 
102543 lbs. = 45-78 tons. 
5. 
Calder Iron, No. 1. 
20693 
•063 
Lanarkshire. Hot blast. 
30101 
•082 
From Exp. 7, Table III. 
39509 
•102 
Diameter 2-490 inches. 
48917 
•121 
•05 
58325 
•143 
•08 
67733 
•164 
•13 
72437 
•175 
•17 
77141 
•187 
•22 
81845 
•200 
•31 
86549 
•213 
•40 
91253 
•60 
93135 
•231* 
•68 
93135 lbs. = 41 -58 tons. 
6. 
London Mixture. 
20693 
•057 
•02 
This pillar broke in three pieces of 
One-half old plate iron and one- 
,30101 
•077 
nearly equal length, splitting at 
half Calder Iron. 
39509 
•097 
•06 
one end. 
From Exp. 10, Table III. 
48917 
•116 
•08 
It would appear that in this pillar. 
Diameter 2-548 inches. 
58325 
•137 
•10 
and in that of Exp. 2, there were 
67733 
•157 
•16 
more points of contrary flexure 
77141 
•179 
•24 
than in others. Plate XXXIII. 
81845 
•191 
•29 
86549 
•205 
•41 
91253 
•224 
•58 
93605 
•234* 
•67* 
93605 lbs. =4 1-79 tons. 
