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![Figure 61 ship4269.jpg Figure 61](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4269.jpg?itok=2j8S4B_J)
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)