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gridiron pendulum

a clock pendulum having, as part of its shaft, an arrangement of brass and steel rods having different coefficients of expansion, such that the pendulum has the same length at any temperature.
Origin of gridiron pendulum
First recorded in 1745-55 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Historical Examples
  • To the best clocks in England it was usual to apply the gridiron pendulum of Harrison or the mercurial pendulum of Graham.

    The Old Furniture Book N. Hudson Moore

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