plumb rule definition

  • noun:
    • A narrow strip of timber with a plumb line hanging as a result, always test verticality.
    • a narrow board with a plumb line, employed by designers and carpenters.
    • A narrow board with parallel edges having a straight line drawn through the middle, and a string carrying a metal body weight affixed in the top end of the range. It is used by masons, bricklayers, carpenters, etc., for determining a vertical.
    • a plumb range attached to a narrow board

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