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 19 Jun. 2021.
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