Figure 45

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.

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Author: Y. Berard/Oceanographic Museum of Monaco/ NOAA

License: Public Domain Mark 1.0 (Public domain)

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Added On	18th October 2015
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