MASKELYNE, Nevil. An Account of the Going of Mr. John Harrison's Watch, at the Royal Observatory, from May 6th, 1766, to March 4th, 1767. Together with the Original Observations and Calculations of the same ... Published by Order of the Commissioners of Longitude, London: W. Richardson & S. Clark and sold by John Nourse, and Mess. Mount and Page, 1767. 4 (280 x 220mm.) (title lightly browned), modern calf-backed boards. Baillie p. 271; Bromley The Clockmakers' Library 567.