Gridiron pendulum

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See under Pendulum.

See also: Gridiron

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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10) Apart from the device that let voyagers tell time under the sea, he also invented the gridiron pendulum, the bi-metallic strip (used in most modern kettles), a grasshopper escapement (a low-friction escapement for pendulum clocks) and an automatic form of manning power.
Behind Harrison's chair stands one of his major innovations, the gridiron pendulum, while in the background to the left is his third sea-clock (H3).
He invented the grasshopper escapement and the gridiron pendulum and a form of maintaining power whilst the mechanism was wound.