ON THE STEENGTH OF PILLAES OF CAST lEON. 
879 
Table III. — Experiments to determine the Strength of Solid Uniform Pillars, 10 feet 
long and 2^ inches diameter nearly, from various parts of the kingdom. The pillars 
were aU cast erect and in dry sand, from the same iron model, nearly 12 feet long ; 
they were afterwards cut to 10 feet long, and their ends turned flat and perpendicular 
to the axis. Two pillars were cast from each kind of iron. The irons are arranged 
in the order of theu* strength. 
No. of Ex- 
periincnt. 
Description of Pillar; each being cast 
solid, 24 inches diameter nearly, and 
turned, 10 feet long, and flat at the ends. 
Weights 
laid on. 
Decrement 
of length. 
Deflection of 
middle. 
Breaking 
weight, or 
that with 
which the 
pillar sank. 
Value of X from formula x— ^ , 
J)'6'bo 
where W is the breaking weight, D 
the diameter, and x the strength of a 
pillar 1 inch diameter and 10 ft. long. 
Value of X 
from 
formula 
D3-S 
Remarks. 
inches. 
lbs. 
inch. 
inch. 
lbs. 
lbs. 
lbs. 
1. 
Old Park Iron, No. 1. 
20693 
•065 
■04 
Stourbridge. Cold blast. 
25397 
•076 
Mean diameter from nine 
30101 
•087 
•06 
measurements 
* '£i 
34805 
•097 
Weight of pillar 151^ lbs. 
39509 
•106 
•08 
44213 
•116 
48917 
■127 
•10 
53621 
■138 
58325 
■149 
•18 
63029 
•161 
•33 
66792 
•171* 
•45* 
66792 
2571 -5 
2692-2 
2. 
Old Park Iron, No. 1 . 
20693 
■072 
Stourbridge. Cold blast. 
25397 
•084 
Mean diameter from eight 
30101 
•095 
measurements 
34805 
■105 
Weight of pillar 154 lbs. 
39509 
•116 
44213 
•127 
48917 
•139 
53621 
•150 
•07 
58325 
•161 
•14 
63029 
■174 
•27 
65381 
■181* 
•31* 
65381 
2436-8 
2552-3 
3. 
Derwent Iron, No. 1. 
20693 
•066 
•08 
Durham. Hot Blast. 
25397 
•077 
Mean diameter from eight 
30101 
•089 
■10 
measurements 
34805 
•100 
Weight of pillar 152 lbs. 
39509 
•112 
•16 
44213 
•123 
•20 
48917 
•137 
•27 
53621 
•151 
•43 
57855 
•161* 
■58* 
57855 
. 2147-2 
2249-2 
4. 
Derwent Iron, No. 1. 
20693 
•060 
•02 
Durham. Hot blast. 
25397 
•071 
Mean diameter from eight 
30101 
•081 
measurements 
>> J ji / 
34805 
•091 
Weight of piUar 15Glbs. 
39509 
•102 
44213 
•113 
48917 
■124 
53621 
•135 
•06 
58325 
•147 
•13 
60677 
•153 
•19 
63029 
•159 
•23 
65381 
•166 
•35 
66733 
•180 
•69 
66733 
2556-6 
2677-4 
5, 
Portland Iron, No. 1. 
20693 
■068 
•09 
Tovine, Scotland. Hot blast. 
25397 
•079 
Mean diameter from eight 
30101 
•090 
•11 
measurements 
34805 
•101 
Weight of piUar 150:} lbs. 
39509 
•112 
•15 
44213 
•124 
•19 
48917 
•136 
•24 
53621 
•150 
■37 
55973 
•46 
58325 
•169 
•68 to ^73 
59736 
■175* 
•84* 
59736 
2332-8 
2441 8 
The quantities marked with an asterisk were computed in each case from the two preceding results, as before. 
5 T 2 
