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 observation and calcultions of the same. By the Revd. Nevil Maskelyne, astronomer royal. Published by order of the commissioners of longitude. - Maskelyne, Nevil (Printed by W. Richardson and S. Clark; and sold by John Nourse, and Mess. Mount and Page, 1767)