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 44
h footof length. PATTERN MAKING 29 The contraction or shrinkage of different metals in the moldsvaries greatly; that for cast iron bemg, as above stated, J inch to eachfoot. For brass, however, the shrinkage is ^ inch to the foot; and formany of the softer metals it is as great as J inch per foot.… … Fig. 61. Shrinkage Rule brass 24f inches long, and for other soft metals 24^ inches in length.They can also be bought made of tempered steel 12| inches, 12j^inches, and 12| inches in length. In making use of the shrinkagerule, the workman will proceed just as though he were using astandard rule;…
Patternmaking
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