An instrument for determining the direction and relative speed of cloud motion. There are two basic designs of nephoscope: the direct-vision nephoscope and the mirror nephoscope.

A device for measuring the direction and angular velocity of clouds.

An instrument for determining the direction of cloud motion. There are two basic designs of nephoscope: the direct-vision nephoscope and the mirror nephoscope. Also called nepheloscope.

Nephoscope is instrument for measuring the altitude, direction, and velocity of movement of clouds.