Harrison, John, a celebrated mechanician, born at Foulby, Yorkshire; was the first to invent a chronometer which, by its ingenious apparatus for compensating the disturbing effects caused by variations of climate, enabled mariners to determine longitude to within a distance of 18 m.; by this invention he won a prize of £20,000 offered by Government; amongst other things he invented the compensating gridiron pendulum, still in use (1693‒1776).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Harrison, Frederic * Harrison, William