oroheliograph

Or`o*he"li*o*graph, n. [Gr. mountain + helio- + -graph.] (Photog.) Defn: 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.

---