Delisle scale
The Delisle scale is a temperature scale that was introduced in 1732 by the French astronomer Joseph Nicolas Delisle ( 1688-1768 ). The unity of the Delisle scale is degrees Delisle, this is not an SI unit.
1732 Delisle designed a thermometer that worked with liquid mercury. As a point of reference, he took the boiling point of water (0 ° De ) in a normal atmospheric pressure ( 1013.25 mbar) and then measuring the change in volume of the mercury. The Delisle thermometers originally had 2400 graduations. In the winter of 1738 and recalibrated Josiah Weitbrecht ( 1702-1747 ), the thermometer when he noted that the change in volume of mercury over this temperature difference corresponds approximately to a ratio of 150 to 10,000. As reference points, the boiling point of water ( 0 ° De ) and the melting point of ice ( 150 ° De ) now served. The Delisle scale thus runs as originally designed by Celsius scale ( boiling point of water and melting temperature ) and thus contrary to the current Celsius scale, which runs from the melting point of ice (0 ° C) to the boiling point of water (100 ° C).
The Delisle thermometer was used for over 100 years in Russia.