Marvin’s Nephoscope to measure direction and velocity of the cloud. This nephoscope is used on land, and made out of a mirror with a string attached to the scale.
Keywordsmirror, weather, meteorology, mirrors, Nephoscope, Cloud Movement Detecting Device, Marvin's Nephoscope
Encyclopaedia Britannica (11th ed., vol. 18) (New York, NY: The Encyclopaedia Britannica Company, 1910)