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Description
Figure 50. Berget double deviation refractometer, developed and devised by theFrenchman Alphonse Berget, professor at the Oceanographic Institute. From about 1911 onward, he was concerned with developing an instrument to measure thedensity of a liquid at sea by a method that would not be affected by the ship'smotion. He described the pictured instrument in 1925. (Image credit: Oceanographic Museum of Monaco | Y. Berard)