The load was measured at each one-fourth inch in deflection, and notes were made of the primary and subsequent failures.
For details of tests and results, see: Cir.

47, U.S.F.S.: Strength of packing boxes of various woods.
Cir.

214, U.S.F.S.: Tests of packing boxes of various forms.
_Vehicle and Implement Woods_ Tests were made by the U.S.Forest Service to obtain a better knowledge of the mechanical properties of the woods at present used in the manufacture of vehicles and implements and of those which might be substituted for them.

Tests were made upon the following materials: hickory buggy spokes (see Fig.

5); hickory and red oak buggy shafts; wagon tongues; Douglas fir and southern pine cultivator poles.
Details of the tests and results may be found in: Cir.