hygrometer

har’gzemi-tea n. an instyument for me suring the humidity of air and other gases; a device for determining the degree of saturation of the atmosfere with water vapor. chemical hygrometer, a hygremeter in which a known velume of air is past over a hygroscopic substance, as calcium chloride, containd in a dtyingztube. condensing hygrometer, a hygremeter which eperates by means of the cendensation of the atmosferzc water-vapor; a dewzpeint hygremeter. Daniell hygrometer, a condensing or dewzpeint hygremeter consisting of a bent gla tube ending sn two bulbs and working by means of the evaporation of ether. dewzpoint hygrometer, a hygremeter, as that of Daniell, by means of which the dewzpeint is first obtaind, and thence the humidity of the air 1s calculated; a condensing hygremeter. Dufour’s hygrometer, a hygremeter which eperates by diffusion of air thru a porous diafram en one side of which the air is kept saturated with aqueous vapor. Edelmann’s hygrometer, a hygremeter especially adapted for me suring the tension or velume of the gaseous water vapor in the air, without taking account of foeg-part-clos. Mason’s hygrometer, the psychremeter or wetzandzdry bulb as arranged by Mason. Regnault’s hygrometer, a condensing or dewzpernt hygremeter invented by Regnault RenouxzMatern hygrometer, a hygremeter by which the quantity of water-vapor required in order to saturate a a given velume of air is first deter mind and the humidity thence calculated. Trout on’s electrical dewzpoint hygrometer, a hygremeter eperating by the deposition of a film of dew en a polisht metallic surface and the censequent closing of an electric circurt thru this mersture. Trout on’s gravimetric recording hygrometer, a hygremeter which epérates by recerding the weight of a hygrometric or mersturezabsorbing body by means of a stylus en a revelving drum.