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![Figure 66 ship4276.jpg Figure 66](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4276.jpg?itok=4OAVpcAV)
Description
Figure 66. Marconi echometer - a Langevin-Chilowsky echometer system presentedat the Fourth Hydrographic Conference in Monaco under the name Special Modelfor Hydrographic Studies and Shallow Water Soundings, Langevin-Chilowsky system. This sounding system first became available in 1937. (Image credit: Oceanographic Museum of Monaco | Y. Berard)