• Webster's Revised Unabridged Dictionary
    • n Thermoscope (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.
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Century Dictionary and Cyclopedia
    • n thermoscope An instrument or a device for indicating variations in temperature without measuring their amount. The name was first applied by Count Rumford to an instrument invented by him, resembling the differential thermometer of Leslie. Out of an indefinite number of thermoscopes, a class of chromatic thermoscopes may be mentioned in which changes in temperature are indicated by changes in the shade or the color of a substance coated with certain chemical preparations. These have been used to some extent for indicating a rise in temperature caused by the heating of a journal in machinery. Thermoscopes consisting of a tube containing air or mercury, and having an adjustable scale, or a scale limited to a few degrees, are used in machines for testing lubricants, in appliances for physical research, as in Osborne's esthermoscope, and in diagnosis, as in Dr. Seguin's thermoscope for detecting minute variations in the temperature of the body.
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Chambers's Twentieth Century Dictionary
    • Thermoscope an instrument for detecting changes of temperature without measuring them accurately
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Webster's Revised Unabridged Dictionary
Thermo-, + -scope,
Chambers's Twentieth Century Dictionary
Gr. thermos, hot—thermē, heat—therein, to heat.


In literature:

We are at the thermoscope.
"Heroes of the Telegraph" by J. Munro
The air-thermoscope of Galileo, illustrated in fig.
"Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2" by Various

In news:

Milestones In Cold Research From Galileo's thermoscope to a recent experiment that reached less than a billionth of a degree above absolute zero .