Try the experiment of concentrating on a thermoscope, by means of a burning-glass, the moon's rays.
Torricelli's apparatus, unlike Galileo's thermoscope, represented the barometer in essentially its classical form.
In order to determine the effect of radiation in the cooling of bodies, Rumford employed the thermoscope referred to by Cuvier.
The instrument shown in his sketch resembles a Galilean thermoscope.
My thermoscope, being fitted somewhat at adventures, I have found at the lowest to be somewhat more than 12.
thermoscope ther·mo·scope (thûr'mə-skōp')
An instrument that indicates slight differences of temperature but does not record them.