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He also invented the dew-point hygrometer known by his name, [3] and a register pyrometer; [4] and in 1830 he erected in the hall of the Royal Society a water-barometer, with which he carried out a large number of observations. [5]
A hygrometer is an instrument which measures the humidity of air or some other gas: that is, how much of it is water vapor. [1] Humidity measurement instruments usually rely on measurements of some other quantities such as temperature, pressure, mass, and mechanical or electrical changes in a substance as moisture is absorbed.
Description of a New Hygrometer: By Mr. John Smeaton, F. R. S., Philosophical Transactions of the Royal Society of London, Series I, vol 61 (1771), p. 198-211; An Experimental Examination of the Quantity and Proportion of Mechanic Power Necessary to be Employed in Giving Different Degrees of Velocity to Heavy Bodies from a State of Rest.
Of particular importance was a hair hygrometer that he devised and used for a series of investigations on atmospheric humidity, evaporation, clouds, fogs and rain (Essais sur l'Hygrométrie, 1783). [10] This instrument sparked a bitter controversy with Jean-André Deluc, who had invented a whalebone hygrometer. [12]
Thomas Crapper was born in Thorne, West Riding of Yorkshire, in 1836; the exact date is unknown, but he was baptised on 28 September 1836.His father, Charles, was a sailor.
The original company, Michell Instruments Ltd, was formed in 1974 in Cambridge, England, by Andrew Michell.In co-operation with scientists at Cambridge University, Michell developed a novel aluminium oxide dew-point sensor based on the thin-film capacitance principle originally proposed by Dr A C Jason et al. at the Torry Research Institute, Aberdeen, UK in the 1950s.
Jean-André Deluc was born in Geneva.His family had come to the Republic of Geneva from Lucca, Italy, in the 15th century. [2] His mother was Françoise Huaut. His father, Jacques-François Deluc, [3] had written in refutation of Bernard Mandeville and other rationalistic writers, but he was also a decided supporter of Jean-Jacques Rousseau.
1947: Holography invented in Rugby, England by Hungarian-British Dennis Gabor (1900–1979; fled from Nazi Germany in 1933). The medium was improved by Nicholas J. Phillips (1933–2009), who made it possible to record multi-colour reflection holograms. 1947: Discovery of the pion (pi-meson) by Cecil Frank Powell (1903–1969).