Fahrenheit, Daniel Gabriel

Experimenta Circa Gradum Caloris. in: Philosophical Tansactions

      LondonforPrinted | W. and J. Innys, 1724. Volume. XXXIII, no. 381, pp. 1-3. The First Appearance Of The Fahrenheit Thermometer FAHRENHEIT, Daniel Gabriel. Experimenta circa gradum caloris. In: Philosophical Transactions. Volume. XXXIII, no. 381, pp. 1-3. [London: Printed for W. and J. Innys, 1724]. The first appearance of Fahrenheit's invention of the Fahrenheit Thermometer. Quarto (8 1/2 x 6 5/8 inches; 215 x 167 mm). [2], 37, [1, blank] pp. Also with Robert Houstoun's "An Account of a Dropsy in the Left Ovary of a Woman" pages 8-15, and additional material. With large folding engraved plate. Disbound. With some very light foxing. Housed in a quarter morocco over marble boards slipcase. "With his 'Experiments concerning the Degrees of Heat' Fahrenheit perfected the modern instrument, his principal innovation being a 'fixed point' of departure, namely the temperature to which water can be cooled when mixed with ice and salt. This he called zero. At the ends of his scale were normal human blood-heat-which he took as 96°-and normal freezing point of water, 32°. When this scale was later extended upwards, the boiling point of water fell at 212o. He may have been the first to use mercury as a thermometric fluid. " (PMM, 182). PMM 182. HBS 64723. $3, 500. Experimenta circa gradum caloris. In: Philosophical Tansactions