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![Figure 20 ship4221.jpg Figure 20](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4221.jpg?itok=fCDn7ez1)
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Figure 20. Lucas scoop sounder, invented in 1891 by Francis Lucas of theEnglish Telegraph Construction and Maintenance Company, this instrument was also called the snapper. It was used primarily by ships engaged in submarine cable laying. It is a derivative of the Ross device, with elements of the Britishbulldog sounder. (Image credit: Oceanographic Museum of Monaco | Y. Berard)