comb nephoscope

comb nephoscope

[¦kōm ¦nef·ə‚skōp]
(engineering)
A direct-vision nephoscope constructed with a comb (a crosspiece containing equispaced vertical rods) attached to the end of a column 8-10 feet (2.4-3 meters) long and supported on a mounting that is free to rotate about its vertical axis; in use, the comb is turned so that the cloud appears to move parallel to the tips of the vertical rods.