The elasticity modulus of a crosshatch reinforced (§' ) material (Fig. 97a) was found by testing one-directional reinforced specimens that were cut o¤ by the angle ' to the axis of tension (Fig. 97b)...

The elasticity modulus of a crosshatch reinforced (§' ) material (Fig. 97a) was found by testing one-directional reinforced specimens that were cut o¤ by the angle ' to the axis of tension (Fig. 97b) for simplicity.

Is it permissible to use such a method?