hygrostatn.
/ˈhʌɪɡrəʊstat/ = humidistat n. 2.
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the world > matter > liquid > moisture or humidity > [noun] > instrument for regulating humidity
humidifier1884
hygrostat1915
humidistat1918
spray pond1924
1915 R. C. Carpenter Heating & Ventilating Buildings (ed. 6) xx. 525 Some form of differential hygrostat..controls the wet bulb temperature with respect to the dry bulb temperature so as to maintain a constant relative humidity.
1918 J. R. Allen & J. H. Walker Heating & Ventilation xvi. 248 In a compressed-air system of control, a diaphragm valve..may be operated by means of a ‘hygrostat’ or ‘humidostat’, which corresponds to the thermostat of a temperature control system.
1937 Archit. Rev. 81 p. lxxii/1 Heating and humidifying equipment are incorporated in each unit, the desired temperature and humidity being automatically controlled by thermostats and hygrostats.
1965 Bull. Entomol. Res. 56 265 Kitchen & Gall (1953) describe a modified Friez hair hygrostat which they used to control a humidifier for an insect breeding room.
This entry has not yet been fully updated (first published 1976; most recently modified version published online March 2018).
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n.1915