thermoscope

/ (ˈθɜːməˌskəʊp) /

a device that indicates a change in temperature, esp one that does not measure the actual temperature

Derived forms of thermoscope

thermoscopic (ˌθɜːməˈskɒpɪk) or thermoscopical, adjective thermoscopically, adverb

The instrument shown in his sketch resembles a Galilean thermoscope.

The Introduction of Self-Registering Meteorological Instruments |Robert P. Multhauf
Torricelli's apparatus, unlike Galileo's thermoscope, represented the barometer in essentially its classical form.

The Introduction of Self-Registering Meteorological Instruments |Robert P. Multhauf
In order to determine the effect of radiation in the cooling of bodies, Rumford employed the thermoscope referred to by Cuvier.

Heroes of Science: Physicists |William Garnett
Try the experiment of concentrating on a thermoscope, by means of a burning-glass, the moon's rays.

An Introduction to the History of Science |Walter Libby

My Thermoscope, being fitted somewhat at adventures, I have found at the lowest to be somewhat more than 12.

Philosophical Transactions of the Royal Society - Vol 1 - 1666 |Various

thermoscope

[ thûr′mə-skōp′ ]

An instrument that indicates slight differences of temperature but does not record them.