nephoscope

[ nef-uh-skohp ]

/ ˈnɛf əˌskoʊp /

an instrument for determining the speed and direction of cloud motion.

Origin of nephoscope

First recorded in 1880–85; nepho- + -scope

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

nephoscope

/ (ˈnɛfəˌskəʊp) /

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