A shorter course in woodworking; a practical manual for home and school (1911)
Wheeler, Charles G. (Charles Gardner), 1855-1946 · New York, London, G.P. Putnam's sons · leaf 225
(Fig. 529),When a log is sawed into boards or planks (Fig. 530) the middle boardshrinks but little in width and in thickness at the centre, but becomesthinner toward the edges. It does not curl, because it is cut through thecentre of the log and has no more tendency to curl one way than the other.… … Fig. 526 Appendix 203 The outside board shrinks least in thickness and most in width, and all,except the middle one, shrink differently on one side from the other. They become convex toward the pith,or heart, and concave towardthe outside. Different kinds ofwood shrink and warp to dif-ferent…
Woodwork
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