Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 22
eartwood to distinguish it from the other whichis called the sap wood. Only the heartwood should be used forbuilding work. The reason why it is harder than the sapwood isthat it is older and has been compressed more and more each yearas the tree has increased in size, and the pores have gradually… … CAIlPE:STilY years, according to the nature of the tree, and those trees which per-form this hardening in the shortest time are usually the most durable.The sap rises in the spring from the roots of the tree to thebranches and twigs, forming the leaves, and in the autumn it Howsback acrain between…
Architecture · Building · Carpentry
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