Definición

• Contraction.  The physical property of metal slightly reducing in size as it cools, particularly in casting; shrinkage. When metal solidifies its molecules are drawn closer together, usually in uniform action, but uneven contraction voids are known to exist. Bronze will shrink from 1½ to 2% during solidification (for other metal ratios see shrinkage).

  excerpted with permission from

  An Encyclopedia of Coin and Medal Technology

  For Artists, Makers, Collectors and Curators

  COMPILED AND WRITTEN BY D. WAYNE JOHNSON

  Roger W. Burdette, Editor

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