1,489,000 | 40.4 | } Close-grained, long-leaf
1,288,000 | 44.2 | } no knots.
| |
1,601,000 | 40.8 | } Loblolly, with
1,017,000 | 41.5 | } knots.
| |
1,670,000 | 47.2 | } Long-leaf yellow
1,382,000 | 42.1 | } pine.
| |
1,695,000 | 50.2 | } Long-leaf yellow
1,625,000 | 45.2 | } pine.
| |
1,637,000 | 43.7 | } Long-leaf yellow
1,658,000 | 40.2 | } pine.
==============================================

The deflection was measured on both sides of each beam by using silk
threads stretched on each side from nails driven about 2 in. above the
bottom of the beam and directly over the rollers which formed the
supports. From a small piece of wood, tacked to the bottom of the beam
at its center and projecting at the sides, the distance to these threads
was measured. These measurements were taken to the nearest hundredth of
an inch. The mean of the deflections was taken as the true deflection
for any load.

[Illustration: FIG. 3.--DEFLECTON CURVES BEAM III]

[Illustration: FIG. 4.--DEFLECTON CURVES BEAM IV]

In computing the various quantities shown in Table 1, the summary of