contraction rule

noun

Definition of contraction rule

: a patternmaker's rule in which the divisions are made larger (¹/₉₆ for iron, ¹/₆₄ for brass) than standard measures to allow for contraction during cooling of the metal being cast

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“Contraction rule.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/contraction%20rule. Accessed 2 Jul. 2020.

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