Figure 50

Figure 50. Berget double deviation refractometer, developed and devised by the Frenchman Alphonse Berget, professor at the Oceanographic Institute. From about 1911 onward, he was concerned with developing an instrument to measure the density of a liquid at sea by a method that would not be affected by the ship’s motion. He described the pictured instrument in 1925.

Photo Category: Oceanography