Harrison, John (1693-1776), born near Pontefract invented the ships first chronometer (ODNB).
Ramsden, Jesse (1735-1800), born at Salterhebble near Halifax designed eyepiece (see ODNB).
Sharp(e), Abraham (bap. 1653-1742), born at Little Horton near Bradford friend of Flamsteed, assisted in setting up Royal Observatory in 1678 (ODNB).
County Record Office
Museum Street, York YO1 2DS, England
Tel 01904 655631
Fax 01904 611631