nephoscope

The nephoscope (Greek: cloud observer) is an instrument used in determining the directions of movement of clouds.
Practical Exercises in Elementary Meteorology|Robert DeCourcy Ward
To measure the motion of clouds the nephoscope (Fig. 1) is used.
Sounding the Ocean of Air|A. Lawrence Rotch
The directions of movement of clouds are determined by means of the nephoscope.
Practical Exercises in Elementary Meteorology|Robert DeCourcy Ward
Such a horizontal mirror, adapted to measure the direction of motion of clouds, is known as a nephoscope.
Practical Exercises in Elementary Meteorology|Robert DeCourcy Ward

If nephoscope observations are made, the monthly summary may include the mean direction of cloud movement for each month.
Practical Exercises in Elementary Meteorology|Robert DeCourcy Ward

British Dictionary definitions for nephoscope

nephoscope

/ (ˈnɛfəˌskəʊp) /

noun

an instrument for measuring the altitude, velocity, and direction of movement of clouds

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British Dictionary definitions for nephoscope

noun