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Figure 43. Nansen total immersion hydrometer, an instrument of variable weightand constant volume. The fact that the instrument is completely immersed during use explains the term constant volume. Its principle was first put forth byGiuseppe Pisati in 1890 and adopted by Fridthof Nansen in 1900. In 1901 it wasused by Jacob Schetelig, Nansen's assistant, from the MICHAEL SARS. (Image credit: Oceanographic Museum of Monaco | Y. Berard)