Question: When designing patterns for casting, patternmakers use special rulers that automatically incorporate solid shrinkage allowances into their designs. Therefore, a 12-in. patternmaker's ruler is longer

When designing patterns for casting, patternmakers use special rulers that automatically incorporate solid shrinkage allowances into their designs. Therefore, a 12-in. patternmaker's ruler is longer than a foot. How long should a patternmaker's ruler be for the making of patterns for (1) aluminum castings, (2) malleable cast iron, and (3) high-manganese steel?

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