Figure 43. Nansen total immersion hydrometer, an instrument of variable weight and constant volume. The fact that the instrument is completely immersed during use explains the term “constant volume.” Its principle was first put forth by Giuseppe Pisati in 1890 and adopted by Fridthof Nansen in 1900. In 1901 it was used by Jacob Schetelig, Nansen’s assistant, from the MICHAEL SARS.
Photo Category: Oceanography