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Description
Figure 61. Electrosounder, used by the Italian Navy in 1954, employed a smallexplosive device which exploded on impact with the bottom and the soundsubsequently was heard at a hydrophone on a ship. The use of explosives fordepth finding was first suggested by a French engineer, Urbain Dortet de Tessanabout 1850. (Image credit: Oceanographic Museum of Monaco | Y. Berard)