thermoscopen.

1617 G. Bianconi Sphæra Mundi, seu Cosmographia Demonstrativa Thermoscopium.]

1656 tr. T. Hobbes Elements Philos. iv. xxx. 387 This Organ is called a Thermometer, or Thermoscope, because the degrees of Heat and Cold are measured and marked by it.

1672 R. Boyle in Philos. Trans. (Royal Soc.) 7 5110 The Air by the seal'd Thermoscope appeared hot for the season.

1778 Philos. Trans. 1777 (Royal Soc.) 68 484 The first inventors..called..their instruments..Baroscopes, Thermoscopes, Microscopes.

1790 De Luc in Philos. Trans. (Royal Soc.) 81 32 The thermoscopes of quicksilver and water.

1842 W. T. Brande Dict. Sci., Lit. & Art 1232/1 The thermometer of Drebbel and Sanctorio..had no scale, and was therefore merely an indicator of changes of temperature, or a thermoscope.

1804 Count Rumford in Philos. Trans. (Royal Soc.) 94 101 An instrument I contrived for measuring, or rather for discovering, those very small changes of temperature in bodies, which are occasioned by the radiations of other neighbouring bodies, which happen to be at a higher, or at a lower temperature. This instrument..I shall take the liberty to call a thermoscope.

1842 W. T. Brande Dict. Sci., Lit. & Art 1232/1 The modification of the air thermometer, called by Leslie a differential thermometer, was claimed by Count Rumford as one of his own inventions, under the name of thermoscope.

1850 W. R. Grove On Correlation Physical Forces (ed. 2) 42 With the most delicate thermoscope, he could detect no indications of transmitted heat.

1860 R. G. Mayne Expos. Lexicon Med. Sci. Thermoscopium, term for an instrument by Rumford for measuring the difference of temperature by dilatation of dry air contained in two balls, which a long tube, twice bent, separates from each other: a thermoscope.

1835 Faraday tr. Melloni in London & Edinb. Philos. Mag. VII. 475 In order to experiment under these circumstances, it is clearly necessary to employ an extremely delicate thermoscope, such as well-constructed thermomultipliers.

1879 tr. T. A. L. Du Moncel Telephone 195 It is therefore a microphone as well as a thermoscope.

1881 Nature 17 Feb. 372/2 The magnetic thermoscope is intended to indicate differences of temperature by showing differences between the magnetic moments of steel magnets.

1877 E. H. Knight Pract. Dict. Mech. 2550/1 Barker and Mayer's thermoscope..is designed to indicate..the existence of excessive heat in journal-bearings... Marcy's thermoscope..is particularly designed for experiments on animal heat.

a1884 E. H. Knight Pract. Dict. Mech. Suppl. 892/2 The varied changes of tint..may serve..as a rough index of the temperature of surrounding bodies, thus constituting the little instrument a thermoscope.