896 
ME. HODGKIXSON’S EXPEEIMEXTAL EESEAECHES 
Experiment 4. 
Cylindrical Pillar, Calder Iron, No. 2. 
Mean diameter from eight admeasurements 2‘469 inches. 
Weight of Pillar 148 lbs. 5 oz.=148-3125 lbs. 
Weights laid on. 
Deflections. 
Decrements of length. 
lbs. 
inch. 
inch. 
20693 
-11 
-070 
25397 
-13 
•084 
30101 
-16 
•097 
34805 
-19 
•110 
39509 
•24 
•122 
44213 
-30 
•130 
48917 
-45 
•147 
53621 
-72 
•165 
55032 broke 
it. Broke 4 :^ inches from the middle. — 
lbs. 
lbs. lbs. lbs. 
Whence 148-312 
: 150 : : 55032 : 55658=reduced breaking weight. 
Experiment 5. 
Cylindrical Pillar, Calder Iron, No. 
2. 
Mean diameter from six admeasurements 2-497 inches. 
Weight of Pillar 150-25 lbs. 
Weights laid on. 
Deflections. 
Decrements of length. 
lbs. 
inch. 
inch. 
20693 
-17 
•077 
25397 
-21 
•089 
30101 
-25 
•102 
34805 
•29 
-117 
39509 
-34 
•131 
44213 
-38 
•144 
48917 
-55 
•158 
53621 
-94 
•182 
55032 Sank without fracture. 
— 
lbs. lbs. lbs. lbs. 
Whence 150-25 : 150 : : 55032 : 54940 = reduced breaking weight. 
lbs. 
55658 + 54940 
2 
=55299 lbs. 
the mean strength of a cylindrical pillar of Calder Iron, No. 2, 10 feet long and 2^ inches 
diameter nearly. 
