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 (1916)
Ritchey, James, Monroe, Walter W. (Walter William), b. 1869 · Chicago, American technical society · leaf 21
6 PATTERN MAKING … Warping of Two Thin Pieces pieces for a pattern, three or more pieces should be used, which willgive satisfactory results if placed together, as shown in Fig. 6. When thin circular disks of largesize are to be glued up for patternsof any kind, the strongest, stiffest,and most satisfactory results…
Patternmaking
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