Oroheliograph

Or`o`he´li`o`graph

n.

1.

(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.

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.