From The Collaborative International Dictionary of English v.0.48:

Oroheliograph \Or`o*he"li*o*graph\, n. [Gr. 'o`ros 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.
   [Webster 1913 Suppl.]
Feedback Form