Antique Daniell's hygrometer. Consisting of a bent glass tube terminating in two bulbs, the one covered with muslin, the other containing ether and a thermometer. There is another thermometer on the supporting stand.

Reference: J. F. Daniell, "On a new Hygrometer, which Measures the Force and Weight of Aqueous Vapour in the Atmosphere, and the Corresponding Degree of Evaporation."

Quarterly Journal of Science 8 (1820): 298-336.

Dates to circa 19th Century Germany.

H: 9 1/2" W: 5 1/2"

Condition: With minor signs of use and age.

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