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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References in periodicals archive
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).
A mechanic art
He invented the grasshopper escapement and the gridiron pendulum and a form of maintaining power whilst the mechanism was wound.
Antiques & Auctions: Maritime timekeeper earned a handsome prize; LONGITUDE: Taken for granted now but it once seemed immeasurable
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