Note 122 — Chapter XII · Globes and Globe Makers of the First Half of the Eighteenth Century—from Delisle to Ferguson

Wolf, op. cit., pp. 400-403. This came to be but one of the many methods employed in the effort to determine longitude. One of the most interesting and most recent is that in which wireless telegraphy has been called into service. See Hoogewerff, Capt. J.A. Washington-Paris Longitude by radio signals by F.B. Littell and G.A. Hill. (In: Astronomical Journal. Albany, 1915.)