III. Observations of the Lunar Eclipse on the 13th October, 1837, made with a view to ascertain the practical advantages of the method of determining the Longitude by that phenomenon, suggested by the late Captain Kater, for a fixed station, and particularly of an adaptation of that method to Nautical purposes, proposed by Captain Beaufort, Hydrographer to the Admiralty. By Captain Basil Hall, R.N. Communicated by Captain Beaufort