47 .-- Design of tension test specimen used in New South Wales.] [Footnote 63: Warren, W.H.: The strength, elasticity, and other properties of New South Wales hardwood timbers, 1911, pp.
58-62.] In making the test the specimen is fitted in the machine, and an extensometer attached to the middle portion and arranged to record the extension between the gauge points 8 inches apart.
The area of the cross section then is 1.226 square inches, and the tensile strength is equal to the total breaking load applied divided by this area.
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" X 2" X 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" X 2".
[Illustration: FIG.

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.