[ 463 ] 
XXII. On an Element of Strength in Beams subjected to Transverse Strain^ named by 
the author “ The Resistance of Flexure T — Second Paper. 
By William Henry Barlow, Esq., F.R.S. &c. 
Eeceived March 12, — Eead March 26, 1857. 
In my former paper on this subject, I pointed out the existence of an element of 
strength in beams Avhen subjected to transverse strain, which had been omitted in the 
generally admitted theory. 
The forms of beam employed in the experiments described in that paper were only of 
two kinds, namely, solid rectangular bars, and open beams or girders. 
In the experiments given in the present paper I have employed other forms, namely, 
square bars broken on their sides, square bars broken on their angles, round bars, 
beams of the I section broken with the flanges horizontal, and similar beams broken with 
the flanges vertical m ; the object of these experiments being, to elucidate the general 
bearing of the subject more clearly, and to determine with greater precision than was 
attempted in my former paper, the laws which govern this resistance. 
The follo^ving are the results of the experiments in which, for the purpose of more 
easy reference, I have numbered the several forms of section in continuation of those 
described in my former paper ; and have also included the results of those experiments. 
Summary of Experiments on Transverse Strength. Solid and open beams. 
Length of bearing 60 inches. 
Number and form of section. 
Total depth 
of beam. 
Depth of 
metal. 
Distance 
between 
the bars. 
Breadth 
of bar. 
Total 
sectional 
area. 
Breaking 
weight. 
No. 1 
■ 
{ 
in. 
2-015 
2-020 
2-073 
2-040 
in. 
2-015 
2-020 
2-073 
2-040 
in. 
Nil. 
Nil. 
Nil. 
Nil. 
in. 
•975 
-980 
1-030 
•990 
sq. in. 
1- 965 
1-980 
2- 135 
2-020 
lbs. 
1664 
1888 
2084 
1916 
Mean 
2-012 
2-012 
Nil. 
•994 
2*025 
1888 
No. 2 
I 
2-54 
2-53 
2-49 
2-50 
1-98 
1-98 
1-98 
1-95 
-56 
-55 
-51 
-55 
2-01 
2-00 
1-96 
1-95 
2188 
2748 
2412 
2524 
Mean 
2-51 
1-97 
-54 
1-005 
1-98 2468 
