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gridiron pendulum

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noun
  1. 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.
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Origin of gridiron pendulum

First recorded in 1745–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018