Lumber is frequently steamed to prevent its checking and “case hardening” while being kiln dried.
127. Lumber Terms and Measurements.
—“Clear” lumber is lumber which is free from knots and sapwood.
“Dressed” lumber or “surfaced” or “sized” lumber is lumber which has passed thru the planer.
The unit of measure is the board-foot which is one inch thick and twelve inches square. Boards less than one inch thick are sold by the square foot, face measure.
Shingles and lath are sold by the bundle. Moldings are sold by “running” or lineal measure.
Prices are usually based upon the thousand feet; thus, 200 feet, 1st, clear, S2S, (sized or surfaced on two sides) at $47 per M.
CHAPTER XII.
Common Woods.
128. Classification.
—According to botanical classification, woods belong to the Flowering Plants (Phanerogamia). Classified further we have: