thermoscope (thermos kop)

[F. thermo scope = Sp. It. termoscopio , θέρμη , heat, + σκοπεῖν, view, examine.]. An instrument or a without measuring their amount. The name was device for indicating variations in temperature 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 cla 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 thermotelephone 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 est her mos cope, and in diagnosis, as in Dr. Seguin's thermoscope for detecting minute variations in the temperature of the body.