Sailing Glossary - Term Comb nephoscope

A direct-vision nephoscope which is constructed in the following manner: a comb consisting of a cross-piece containing equispaced vertical rods is attached to one end of a column eight to ten feet long and is 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.