nephoscope

The nephoscope (Greek: cloud observer) is an instrument used in determining the directions of movement of clouds.

Such a horizontal mirror, adapted to measure the direction of motion of clouds, is known as a nephoscope.

If nephoscope observations are made, the monthly summary may include the mean direction of cloud movement for each month.

Close by there was also a nephoscope for determining the motion of clouds.

To measure the motion of clouds the nephoscope (Fig. 1) is used.