Note 407 — I.—PHÆNOGAMOUS OR FLOWERING PLANTS. (continued 3)

It is much used for the wheels (technically “sheaves”) of ships’ blocks (pulleys), the circumference of which ought to consist of the white sapwood. It is also required for caulking mallets, skittle balls and for the large balls used in American bowling alleys, for which purposes it should be as sound and homogeneous as possible.