books.google.comhttp://books.google.com/books/about/the_nautical_almanac_and_astronomical_ep.html?id=0PcNAAAAQAAJ&utm_source=gb-gplus-sharethe nautical almanac and astronomical ephemeris for the year 1797. published by order of the commissioners of longitude.
Page 150 - Time found compared with that shown by the Watch ; -the Difference will be the Longitude in Time from the Meridian by which the Watch was set, as near as the Going of the Watch can be depended upon.