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![Figure 52 ship4260.jpg Figure 52](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4260.jpg?itok=k0APwEE7)
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Figure 52. Thoulet sounder devised by Professor Julien Thoulet of the University of Nancy in 1908. This was a modification of the Belloc sounder that Professor Thoulet wished to make more portable and to have a lower cost. No informationis available concerning the test and use of this machine. (Image credit: Oceanographic Museum of Monaco | Y. Berard)