Hydroscope vs. Hygroscope

Hydroscopenoun

A device for viewing objects below the surface of the water.

Hygroscopenoun

An instrument that indicates changes in atmospheric humidity

Hydroscopenoun

(historical) A kind of water clock consisting of a cylindrical graduated tube, from which the water escaped through a hole in the bottom.

Hygroscopenoun

An instrument which shows whether there is more or less moisture in the atmosphere, without indicating its amount.

Hydroscopenoun

An instrument designed to mark the presence of water, especially in air.

Hygroscopenoun

hygrometer that shows variations in the relative humidity of the atmosphere

Hydroscopenoun

A kind of water clock, used anciently for measuring time, the water tricking from an orifice at the end of a graduated tube.

Hydroscope

The word hydroscope is used to mean any of several instruments related to water. One kind is an instrument for making observations below the surface of water, such as a long tube fitted with various lenses arranged so that objects lying at the bottom can be reflected upon a screen on the deck of the ship that carries it.