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![Figure 13 ship4296.jpg Figure 13](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4296.jpg?itok=Hu2N0U7P)
Description
Figure 13. Negretti and Zambra thermometer, 1878 model. This instrument is the direct ancestor of most reversing thermometers used up to this time. This wasthe first instrument to break the column of mercury after reversing to obtainthe reading. It was entirely enclosed in a double envelope of glass toeliminate pressure effects. (Image credit: Oceanographic Museum of Monaco | Y. Berard)