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A measure for the higher degrees of heat, such as the common thermometers afford for the lower ones, would be an important acquisition, both to the philosopher and the practical artist. The latter must feel the want of such a measure on so many occasions; particularly when he attempts to follow, or apply to use, the curious experiments of Mr. Pott, related in his Lithogeognosia, and other modern writers upon similar subjects.

philosophical transactions of the royal society of london

XIX. An attempt to make a thermometer for measuring the higher degrees of heat, from a red heat up to the strongest that vessels made of clay can support