, an instrument shewing the changes happening in the air with respect to heat and cold.
The word Thermoscope is often used indifferently with that of thermometer. There is some difference however in the literal import of the two; the first signifying an instrument that shews or exhibits the changes of heat &c to the eye; and the latter an instrument that measures those changes; so that a thermometer should be a more accurate Thermoscope.
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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.
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