pl23_ship4290.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23ship4290jpgDescription
Figure 10. Protected Six thermometer constructed by Negretti and Zambra in 1857. This type of thermometer protected the reservoir of mercury against the effects of pressure by having a second glass envelope which inhibited the heatingeffect of the pressure.
Credit
Oceanographic Museum of Monaco
Photographer
Y. Berard
Collection
Voyage to Inner Space
History of Oceanography Collection
The Early Instruments - Collections of the Oceanographic Museum at Monaco
Thermometers and Other Temperature Measuring Equipment
Keywords
Oceanography
Historical instruments