Wet & dry bulb hygrometer. Range 20-150 deg. F, made or distributed by J. Grimoldi, Melbourne. Used at Melbourne Observatory.

A hygrometer measures the amount of humidity in the atmosphere.

Physical Description

Tubes 9 in. (22.9 cm.) long, bulb of normal glass & English lead capillary fitted on a nickel plated brass scale plate mounted on a board. Glass water reservoir with bronzed brass bracket.

More Information