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Modified version of the Trento-class, built under the 1929-1930 construction program, laid down by Ansaldo, Genoa, Italy on 11 June 1930, launched on 31 August 1932, completed on 19 August 1933, sunk by British and Italian frogmen at La Spezia on 21 June 1944, salvaged in September 1949 and scrapped.
The US 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.
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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