ON THE STRENGTH OF PILLARS. 
437 
Farther remarks on Table II. The ratio T : C shows the position of the neutral 
line, as described in the notes to Table I. The two pillars that stand first in this 
Table had discs upon their ends, two inches diameter, turned flat ; and the weight 
of the pillar, as set down, is that without the discs. These were added on account 
of the smallness of the diameter, ’51 inch, as compared with the length, 60| inches, 
to give the ends a firmer bearing ; but in all other instances, the pillars in this Table 
were without discs. 
The forms of fracture o, p, q, &c. Plate XV., referred to in these Tables, and the 
marks upon the pillars over them, show the manner, and into what number of pieces, 
some of the specimens broke, though the figures are not drawn to a scale. The exact 
dimensions of these pillars will be obtained from the Tables. 
Table III. — Rectangular, or Square Uniform Pillars of Low Moor Iron, No. 3, 60^ 
inches long, rounded at the ends. Plate XV. No. 3, A, B, C. 
Dimensions 
of section. 
Mean di- 
mensions, 
or side of 
equal 
square. 
Weight 
of pillar. 
Mean 
■weight. 
qa 
<u 
P 
• S' S O 
qa 
fe 3 ' 
Cj o 
■ £ 
Mean 
breaking 
weight. 
Remarks. 
inch. inch. 
•77 x *77 
•77x-78 
•77x-77 
inch. 
•7716 
lbs. oz. 
9 3§ 
9 3f 
9 3§ 
lbs. oz. 
9 3§ 
inch. 
lbs. 
lbs. 
1251 
1307 
1251 
lbs. 
1269 
Broke by bending in direction of diagonal. 
Broke by bending in direction of diagonal. 
1-02 x 1-04 
16 7 
>1-0275 
1-03x1-02 
>16 3t 
16 0 
•01 ? 
•02 
•04 
•08 
•16 
•23 
•43 
•01 ? 
•02 
•05 
•09 
•22 
•45 
1118 
1364 
2036 
2708 
3380 
3716 
4052 
1118 
1364 
2036 
2708 
3380 
3716 
4164 
> 3968 
3772 
Broke three inches from middle, by bending in 
direction of diagonal, a wedge ‘25 inch deep 
separating from comer, the diagonal being 
1'45 inches long. 
Broke as before, depth of wedge '28 inch. 
1-54 x 1-52 
35 9 
>1-540 
1-54x1-56 
>35 15| 
36 6 
bent 
•01 
•02 
•05 
•17 
•33 
bent 
•015 
•02 
•11 
•23 
•35 
•44 
•52 
3355 
5467 
7483 
10843 
14203 
15861 
2141 
4465 
6481 
11169 
13565 
14461 
14909 
15357 
A B, the neutral line, 
the triangle being 
compressed. B C 
= '35 inch. 
16673 
>16127 
15581 
After hearing 14203 lbs. it was unloaded and 
returned to - 01 inch. 
A 
c 
A B, the neutral line. 
A C, = '45 inch. 
The Table above may be considered as a supplement to Table I., the object of the 
experiments in this being, to ascertain whether square pillars of different diameters 
varied in their strength according to the same laws that round ones do, a matter 
which will be examined into further on. 
