shrinkage rule (shring kajrol)

A rule, used by pattern-makers, in which the graduations are so much larger than the normal measurements that the patterns measured off by such a rule will be large enough to allow for shrinkage, without any computation on the part of the workman. The rule must be graduated with reference to the particular metal to be cast. shrinker (shring'ker), n. One who shrinks; one who withdraws from danger. shrinking-head (shring'king-hed), n. A ma of molten metal poured into a mold to compensate for the shrinkage of the first casting. Also called sinking - head and riser. shrinkingly (shring'king-li), adv. In a shrinking manner; by shrinking.