THE MECHANICAL PROPERTIES OF WOOD




[Illustration: Frontispiece. _Photo by the author_.

Photomicrograph of a small block of western hemlock. At the top
is the cross section showing to the right the late wood of one
season's growth, to the left the early wood of the next season.
The other two sections are longitudinal and show the fibrous
character of the wood. To the left is the radial section with
three rays crossing it. To the right is the tangential section
upon which the rays appear as vertical rows of beads. X 35.]




THE MECHANICAL PROPERTIES OF WOOD

_Including a Discussion of the Factors Affecting the Mechanical
Properties, and Methods of Timber Testing_


BY SAMUEL J. RECORD, M.A., M.F. ASSISTANT PROFESSOR OF FOREST
PRODUCTS, YALE UNIVERSITY


FIRST EDITION FIRST THOUSAND