Oroheliograph

Or′o‐he″li‐o‐graph (?), n. [Gr. � mountain + helio- + -graph.] (Photog.) A camera for obtaining a circular panoramic view of the horizon. The photographic plate is placed horizontally with a vertical lens above. A mirror of peculiar shape reflects light from the entire horizon to the lens, by means of which it is focused upon the plate.