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![Figure 42 ship4414.jpg Figure 42](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4414.jpg?itok=kfcBvoWC)
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Figure 42. Buchanan hydrometer made at the request of John Y. Buchanan duringthe CHALLENGER Expedition. These were instruments with variable weight andvolume. Two of these instruments were improved and modified by Victor Chabaudand used during the Belgium Antarctic Expedition from the BELGICA from 1897 to1899. (Image credit: Oceanographic Museum of Monaco | Y. Berard)