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 145
Fig. 229. Section of Globe Valve side may be very simple, the inside is intricate and requires con-siderable practice and skill to so construct the core boxes that thecore can be withdrawn from them, and at the same time give uni-form thickness and strength to all parts of the shell and to…
Patternmaking
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