898 
ME. HODG-KINSOX’S EXPEEIMEXTAL BESEAECHES 
Experiment 8. — Triangular Pillar, Calder Iron, Xo. 2. 
Mean from six admeasurements of sides of triangle near the middle 
3-545 inches. 
Weight of Pillar 158-75 lbs. 
Weights laid on. 
Deflections. 
Decrements of length. 
lbs. 
inch. 
inch. 
20693 
■23 
•080 
25397 
•27 
•092 
30101 
•33 
•107 
34805 
•39 
•121 
39509 
•46 
•134 
44213 
«53 
•147 
48917 
•64 
•161 
53621 
•79 
•177 
58325 
1-06 
•203 
60677 Broke, having bent parallel to 
one side. — 
lbs. lbs. 
lbs. lbs. 
Whence 158-75 : 150 : 
: 60677 : 57332 = reduced breaking weight. 
This triangular pillar differed but little, in the form of its fracture, from the pre- 
ceding rectangular one, as shown by the figure of the compressed part along its side ; 
its strength, however, is greater than that of any other yet tried. 
Experiment 9. — Triangular Pillar, Calder Iron, No. 2. 
Mean breadth of the sides from nine admeasurements, in three parts, near to the 
middle 3-47 inches. 
Weight of PiUar 155-75 lbs. 
Weights laid on. 
Deflections. 
Decrements of 
lbs. 
inch. 
inch. 
20693 
•08 
•070 
25397 
•09 
•082 
30101 
•11 
•093 
34805 
•14 
•105 
39509 
•18 
•117 
44213 
•22 
•130 
48917 
•27 
•141 
53621 
•36 
•154 
58325 
•48 
•169 
63029 
•69 
•185 
67263 Broke. 
See form of 
fracture. — 
lbs. lbs. lbs. lbs. 
Whence 155-75 : 150 : : 67263 : 64780; 
breaking weight. lbs. 
: reduced 
the mean strength of a triangular pillar, 10 feet 
long, if its weight were 150 lbs. 
