Extensive experiments show, however, (1) that the modulus of elasticity is approximately the same for large timbers as for small clear specimens cut from them, and (2) that the fibre stress at elastic limit for large beams is, except in the weakest timbers, practically equal to the crushing strength of small clear pieces of the same material.[57] [Footnote 57: Bul.

108, U.S.Forest Service: Tests of structural timbers, pp.

53-54.] MOISTURE DETERMINATION In order for tests to be comparable, it is necessary to know the moisture content of the specimens at the zone of failure.

This is determined from disks an inch thick cut from the timber immediately after testing.
In cases, as in large beams, where it is desirable to know not only the average moisture content but also its distribution through the timber, the disks are cut up so as to obtain an outside, a middle, and an inner portion, of approximately equal areas.

Thus in a section 10" x 12" the outer strip would be one inch wide, and the second one a little more than an inch and a quarter.