You searched for: “heliograph
heliograph (s) (noun), heliographs (pl)
1. An instrument that reflects sunlight to a remote station; used especially in signaling and surveying.
2. Name given to an engraving obtained by a process in which a specially prepared plate is acted on chemically by exposure to light.
3. An apparatus for taking photographs of the sun.
4. An instrument for measuring the intensity of sunlight.
This entry is located in the following units: grapho-, graph-, -graph, -graphy, -grapher, -graphia (page 43) helio-, heli- (page 2)