Answer: Nephoscopes are used for measuring the speed and direction of cloud motion, so the units of the measurement are those of speed and direction.
There are several types of nephoscope: the comb nephoscope developed by Besson; the mirror nephoscope developed by Finemann; and the grid nephoscope, a variation on the comb modified by the Norwegians.
Among the various other forms of this instrument are the nephodoscope of Fornioni, the marine nephoscope of Finemann, the simple mirror with attachments used by Clayton, the cloud camera of Vettin, and the altazimuths of Mohn and Lettry.
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