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NOAA Photo Library Image - ship4423

Figure 49. Fery refractometer, an instrument first suggested by Julius Hilgard of the United States Coast and Geodetic Survey to measure the density of sea water by relating the index of refraction of a liquid to its density. The instrument shown was developed by the Frenchman Charles Fery in 1891.

Image ID: ship4423, Voyage To Inner Space - Exploring the Seas With NOAA Collect
Photographer: Y. Berard
Credit: Oceanographic Museum of Monaco

Category: Oceanography/

High Resolution Photo Available





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Last Updated:
May 12, 2014