Hy*grom"e*ter (?), n. [Gr. wet, moist + -meter: cf. F. hygrometre.] Physics
An instrument for measuring the degree of moisture of the atmosphere.
Daniell's hygrometer, a form of hygrometer consisting of a bent glass tube terminating in two bulbs, the one covered with muslin, the other of black glass, and containing ether and a thermometer. Ether being poured on the muslin, the black ball, cooled by the evaporation of the ether within, is soon covered with dew; at this moment, the inclosed thermometer gives the dew-point, and this, compared with the reading of one in the air, determines the humidity.
© Webster 1913.