The choice between the two radial and between the two tangential surfaces and the distribution of the penetrations over the surfaces will be so made as to get a fair average of heart and sap, slow and fast growth, and spring and summer wood.

Specimens will be 2" X 2" X 6".
_Shear_: The tests will be made with a tool slightly modified from that shown in Circular 38.

The speed of descent of head will be 0.015 inch per minute.

The only measurements to be made are those of the shearing area.

The offset will be 1/8 inch.
Specimens will be 2" X 2" X 2-1/2" in size.