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![Figure 63 ship4271.jpg Figure 63](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4271.jpg?itok=4hAHAKCN)
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Figure 63. Marti's continuous recording sounder built by the French engineerPierre Marti. In 1919, Marti began designing and describing sounding machinesbased on acoustic methods. This recording device allowed measuring time ofsound emanation and time of reception, thus giving travel time which can beused to determine depth. (Image credit: Oceanographic Museum of Monaco | Y. Berard)