The Coast Artillery School developed for shore-based observation posts the bump-method for spotting and recognizing a ship hull down over the horizon. The method was applying to a ship from the top down and the top third of the superstructure first appearing over the horizon and this reducing to a simplified silhouette, in fact just a rough outline of the characteristic upper portions of the superstructure.
Laid down at New York Shipbuilding Corporation on 25 January 1910, launched by Mary Louise Macon at New York Shipbuilding Corporation on 14 January 1911, commissioned on 17 September 1912, sunk as part of the Operation Crosssroads (nuclear weapon test) at the Bikini Atol on 25 July 1946, decommissioned on 29 July 1946 and stricken on 15 August 1946. Part of the Wyoming-class, preceded by the Florida-class and succeeded by the New York-class. There were 3 preliminary designs for this class drawn on base of the preceding Florida-class of which design 601 was chosen with a main armament of 12-30,5cm/12” guns. The building was approved on 3 March 1909.
Sources
John D. Neill, “The Bump Charts” in: Coast Artillery Journal, Jan-February 1944, p. 31-33.
“Bumps. Warships are quickly recognized by new Coast Artillery Bump Silhouettes” in: U.S. Army-Navy Journal of Recognition, November 1943, No. 3., p. 21-25.
ONI. FM 30-50. Recognition pictorial manual of naval vessels, 15 September 1943.
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