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 149
Fig. 235. Dry-Sand Cores before PastingTogether >vr..V,; y :C r -~ … -i«y-&£ Fig. 236. Sectional View of Dry-Sand Core and fragile character of wood for boxes of this kind, this core boxwill be made of iron. The wooden pattern for the metal core boxmust then have an allowance for double shrinkage, and to avoid PATTERN MAKING 133 excessive weight, the box is made…
Patternmaking
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