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.
At many of the86 more important stations the movements of clouds are observed with a nephoscope.
The directions of movement of clouds are determined by means of the 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.