Educational woodworking for home and school (1908)
Park, Joseph C · New York, MacMillan · leaf 254
tracts of hard fibers forming the firmpart of oak wood; pr, pith rays. rings distinct by a zone of large pores collected in thespring wood, alternating with the denser summer wood(Fig. 235). FOR HOME AND SCHOOL 235 III. Diffuse-porous Woods. — Pores numerous, usuallynot plainly visible on cross… … Beech . J Sycamore r Birch Fig. 236. — Diffuse-porous woods. «?•, annual ring; pr, pith rays whichare broad at a, fine at 6, indistinct at d. Note. — The above described three groups are exog-enous, i.e. they grow by adding annually wood on theircircumference. A fourth group is formed by the…
Manual training · Woodwork
Internet Archive · University of Toronto, Robarts Library · Public Domain Mark 1.0. Free to use for anything.
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