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Rh that invented by the Frenchman Réaumer finds no credit in France, but is popular in Germany; and that of Celsius, the Swede, modified by Christin, of Lyons, is used chiefly in France, Belgium, and Switzerland.

Secondly, no one of the thermometers now in use has exactly the scale originally devised by the person whose name is attached to it, later and more perfect methods of manufacture having modified the primary form.

The following table of thirty-five thermometer scales has been compiled from many sources, including the tables of Dr. Martine and of Van Swinden.