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![Figure 62 ship4358.jpg Figure 62](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4358.jpg?itok=RcA7A1Wq)
Description
Figure 62. Breguet-Saxton metallic thermometer first invented about 1817 by the instrument maker Louis Abraham Breguet. The first of this type was composed of platinum, silver, and gold with the silver placed in the center. Differentialexpansion of the metals provided the temperature measurement. In 1848, JosephSaxton made a similar one for the U. S. Coast Survey but it was inaccurate. (Image credit: Oceanographic Museum of Monaco | Y. Berard)