ON THE STEENGTH OF PILLAES OF OAST lEON. 
881 ) 
Table VII. (continued). 
Canon Iron, No. 1. Diameter 2-510 inches. Distance between the supports 4 feet 6 inches. 
First half of bar. 
Second half of bar. 
Weights laid on. 
Deflections. 
Weights laid on. 
Deflections. 
lbs. 
560 
1120 
1680 
2240 
2800 
3080 
3428 
broke. 
inch. 
•07 
•155 
•25 
•35 
•46 
•54 
•62* 
ult. defl. 
lbs. 
560 
1120 
1680 
2240 
2800 
3080 
3428 
broke. 
inch. 
•08 
•16 
•26 
•37 
•48 
•55 
•63* 
ult. defl. 
Breaking weight of first bar 
Breaking weight of second bar ... 
Breaking weight for lO-ft. bar 
Breaking weight for 7-ft. 6-in. bar 
lbs. 
342 g ]- Mean 3428 lbs.; whence 
= 1543 
= 2057 
Table VIII. — Crushing weights of short cylinders of different kinds of Cast Iron, cut 
from the bars, 2 ^ inches diameter previously used, and now turned to be f inch 
diameter nearly, and l-l inch high. The results are means from three or four 
experiments on each kind of iron. The specimens were usually cut out of the iron 
between the centre and . the circumference of the bar, denominated the medium 
part. In several cases they were cut out of the centre of the bar, and sometimes 
out of the cfrcumference. 
Description of Iron. 
Diameter of 
specimen. 
Crushing 
weight of 
specimen. 
Crushing weight per square inch 
of section. 
inch. 
lbs. 
lbs. 
Old Park Iron, No. 1. 
Medium. 
•747 
■747 
38333 87466 
38862 88674 
Old Park Iron, No. 1. 
Centre. 
•747 
•747 
•747 
•747 
32923 
32453 
32923 
32571 
75122 
74050 
75122 
74319 
Derwent Iron, No. 1. 
Medium. 
•747 
•747 
•747 
■•747 
43096 
42684 
42684 
41861 
98334 
97394 
97394 
95517 
Coltness Iron, No. I. 
Medium. 
■747 
•747 
•747 
•747 
27749 
27925 
27455 
27396 
63316 
63718 
62646 
62511 
Blaenavon Iron, No. I. 
Medium. 
■748 
•748 
•748 
31336 
31395 
30748 
71310 
71444 
69972 
Level Iron, No. 1. 
Medium. 
•749 
30277 
68716 
•748 
30101 
68500 
•750 
30101 
68135 
•749 
29748 
67516 
CaiTon Iron, No. 1. 
Medium. 
•750 
.•750 
•751 
•751 
31747 
29278 
30101 
30101 
71860 
66272 
67953 
67953 
London Mixture. 
Medium. 
•749 
•750 
•749 
36157 
35452 
35452 
82061 
80247 
80461 
Calder Iron, No. 1. 
Medium. 
•750 
38039 
86103 
•749 
35040 
79526 
•750 
38980 
88233 
•749 
37333 
84730 
1 88070 lbs. =39-32 tons. 
1 74653 lbs. =33-33 tons. 
|971601bs.=43-37 tons. 
jeSOrS lbs. = 28-14 tons. 
70909 lbs. =31’66 tons. 
1-68217 lbs.=30-45 tons. 
|- 68509 lbs. =30‘58 tons. 
- 80923 lbs. =36-08 tons. 
84648 lbs. =37-79 tons. 
