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The Strength of North American Woods
Harold Scofield Betts
出版
U.S. Department of Agriculture
, 1929
URL
http://books.google.com.hk/books?id=bKYoAAAAYAAJ&hl=&source=gbs_api
EBook
FULL_PUBLIC_DOMAIN
註釋
Tests to determine the mechanical properties of wood, such as bending tests, compression tests, shearing tests, etc., to be strictly comparable must be made on straight-grained pieces free from defects, such as knots, shakes, etc., and in the same condition of seasoning. It would manifestly be misleading to compare the strength of oak containing defects with clear hemlock or the strength of green ash with dry birch.