The Collaborative International Dictionary
Thermoscope \Ther"mo*scope\, n. [Thermo- + -scope.] (Physics) An instrument for indicating changes of temperature without indicating the degree of heat by which it is affected; especially, an instrument contrived by Count Rumford which, as modified by Professor Leslie, was afterward called the differential thermometer.
Wiktionary
n. A scientific instrument that measures the changes in temperature.
Wikipedia
Usage examples of "thermoscope".
If we make the experiment with two such thermoscopes we at once become aware of something which usually escapes us, our attention being fixed on the figures recorded by the two instruments.
If we make the experiment with two such thermoscopes we at once become aware of something which usually escapes us, our attention being fixed on the figures recorded by the two instruments.