Direct-vision nephoscope

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direct-vision nephoscope

The class of nephoscope in which the observer notes the motion of the cloud by looking directly at it through the instrument.

These instruments consist of some form of rectangular gridwork supported on a column and free to rotate about the vertical axis. The observer aligns the gridwork so that the cloud appears to move parallel to its major axis.
See comb nephoscope, grid nephoscope.

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