Plumb Rule

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A narrow board with parallel edges having a stright line drawn through the middle, and a string carrying a metal weight attached to the upper end of the line. It is used by masons, bricklayers, and carpenters to determine a vertical.

Keywords

Ruler

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Source

William Dwight Whitney The Century Dictionary and Cyclopedia: An encyclopedic Lexicon of the English Language (New York, NY: The Century Co., 1889)

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