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![Figure 73 ship4450.jpg Figure 73](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4450.jpg?itok=odTUS7pS)
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Figure 73. Thoulet device for measuring the virtual density of large samples.Julien Thoulet described this method in 1905 for determining the apparentdensity of pumice stones, in order to better understand the origin of theserocks which were found in abundance in bottom samples obtained by thePRINCESSE ALICE. (Image credit: Oceanographic Museum of Monaco | Y. Berard)