pl23_ship4419.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23ship4419jpgDescription
Figure 45. Pettersson small chain hydrometer, designed by Professors Otto andHans Pettersson in 1917. This instrument eliminated difficulties associatedwith 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 thefloat as a function of the density of the liquid.
Credit
Oceanographic Museum of Monaco
Photographer
Y. Berard
Category
Voyage to Inner Space
History of Oceanography Collection
The Early Instruments - Collections of the Oceanographic Museum at Monaco
Miscellaneous Instruments, Deck Gear, and Laboratory Instruments
Keywords
Oceanography