THERMOSCOPE
Source: 566, 567
thermoscope. Thermoscope, n. an instrument to discover heat
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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.