Pattern making; a practical treatise for the pattern maker on wood-working and wood turning, tools and equipment, construction of simple and complicated patterns, modern molding machines and molding practice (1921)
Ritchey, James, Monroe, Walter W. (Walter William), b. 1869 · Chicago, American technical society · leaf 20
of the wood. Even under cover and in a dry place, wood has a tendencyto warp on account of the greater shrinkage of the newer as com-pared with the older cells of the wood tissue or fiber in the side ofthe board nearest to the outside or sap wood of the tree. The innerside A of the board, Fig. 3,… … Fig. 3. Effect of Older Fibers inWarping Fig. 4. Reversing Layers in Build-ing Up greater extent than those of A, thus causing the board to draw orwarp in the direction indicated by the dotted lines. Correction hy Reversing Grain. In gluing or building up stockfor a pattern, this tendency may be…
Patternmaking
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