TENSION TEST AT RIGHT ANGLES TO THE GRAIN
A static testing machine and a special testing device ([see Fig. 48]) are required. The latter consists essentially of two double hooks or clamps, one of which is suspended from the centre of the top of the cage, the other extended above the movable head. The specimens are 2" × 2" × 2.5". At each end a one-inch hole is bored with its centre equidistant from the two sides and 0.25 inch from the ends. This makes the cross section to be tested 1" × 2".
Figure 48
Design of tool and specimen for testing tension at right angles to the grain.
The free ends of the clamps are fitted into the notches in the ends of the specimen. The movable head of the machine is then made to descend at the rate of 0.25 inch per minute, pulling the specimen in two at right angles to the grain. The maximum load only is taken and the result expressed in pounds per inch of width. A piece one-half inch thick is split off parallel to the failure and used for moisture determination.
TORSION TEST[64]
Apparatus: The torsion test is made in a Riehle-Miller torsional testing machine or its equivalent. ([See Fig. 49].)
