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Figure 13

Figure 13. Negretti and Zambra thermometer, 1878 model. This instrument is the direct ancestor of most reversing thermometers used up to this time. This was the first instrument to break the column of mercury after reversing to obtain the reading. It was entirely enclosed in a double envelope of glass to eliminate pressure effects.

Photo Category: Oceanography - Historical instruments

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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