A treatise on architecture and building construction . Fig. 33. The manner inwhich the annual rings ofgrowth are disposed onthe end section of theplank, has a great influ-ence on its behavior, afterhaving been cut from the log. During the process of sea-soning the lumber, or the drjnng and hardening of its fibersby the evaporation of the natural sap, there is an ever prev-alent tendency for the boards or planks to curl and warp, Fig. 7. 16 CARPENTRY. 9

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Keywords: ., bo, bookcentury1800, booksubjectarchitecture, booksubjectbuilding