The gridiron pendulum was an improved clock pendulum invented by British clockmaker John Harrison around 1726, which didn't change in length with temperature, so that its period of swing stayed constant with changes in ambient temperature. It consisted of alternating zinc and iron rods assembled so that their different thermal expansions (or contractions) cancel each other out.

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  • The gridiron pendulum was an improved clock pendulum invented by British clockmaker John Harrison around 1726, which didn't change in length with temperature, so that its period of swing stayed constant with changes in ambient temperature. It consisted of alternating zinc and iron rods assembled so that their different thermal expansions (or contractions) cancel each other out.
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  • The gridiron pendulum was an improved clock pendulum invented by British clockmaker John Harrison around 1726, which didn't change in length with temperature, so that its period of swing stayed constant with changes in ambient temperature. It consisted of alternating zinc and iron rods assembled so that their different thermal expansions (or contractions) cancel each other out.
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  • Gridiron pendulum
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