18,5 Valencia: Commercial Philippine Timbers 498 
tween the supports. As the beam deflects, the scale moves down, 
while the wire does not change its original position. The dis- 
tance the scale moves relative to the wire indicates the amount 
of deflection or bending. This method gives deflection to 0.01 
inch, which is sufficiently accurate for tests on structural sizes. 
The load deformation readings are recorded as indicated in figs. 
2 and 3, and the load at elastic limit is determined by drawing 
a straight line through the greatest possible number of points, 
the point at which the curve departs from the straight line 
being taken as the load at elastic limit. This method of locating 
the elastic limit is clearly indicated in the figures. 
Deflection in inches. 
10 20 30 
oximuim load 
of 
40 gia 
ae 
iP 
§ 4— 
g dL 
5 
° 
3 dL 
= 
_ 
- A Elaskictilnie 
3 : 
oe 
'@ 
Fic. 2. Bending; 7.88 inches by 11.85 inches; 15-foot span; third-point loading ; apitong. 
