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NOAA Photo Library Image - ship4419

Figure 45. Pettersson small chain hydrometer, designed by Professors Otto and Hans Pettersson in 1917. This instrument eliminated difficulties associated with the surface tension of the sample as well as variations of volume. A small metal chain helped achieve a balance by compensating for the buoyancy of the float as a function of the density of the liquid.

Image ID: ship4419, 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:
November 10, 2017