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Gridiron pendulum

 - 1 dictionary result

gridiron pendulum

–noun
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:
1745–55
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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