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 0° to 100°. Above the scale is the inscription: "Cilinder termometron Ferneid."

Fahrenheit was followed almost immediately by a host of imitators, each devising a scale differing from Fahrenheit's and from one another, none of them possessing any special advantage. In 1712 to 1713, Fahrenheit, being in Berlin, communicated his method of constructing thermometers to his teacher of higher mathematics, Prof. Barnsdorf, and the latter made instruments with a scale of his own, the relation being as follows:

Barnsdorf taught the art to Dr. Lange, professor of mathematics in Halle, and he devised a scale of his own:

Besides these imitators of Fahrenheit there may be named Christian Kirch, professor of astronomy in Berlin, Chr. Friedr. Ludolff,