Nevil Maskelyne (1732-1811 English astronomer who developed the method of determination of longitude by method of lunars, also determined Earth's density and served as Astronomer Royal. A.L.S. 1p. 12mo., Greenwich, July 19, 1773 to Mr. Nourse: "... deliver to the Bearer a set ofmayer's Tables with the explanation of methods Longitudinum parameter, on account of the Board of longitude Laid down, one tear in text with no paper loss.