HELIOGRAPH

He″li‐o‐graph (hē″lĭ‐ō̍‐grȧf), n. [[Helio- + -graph.]] 1. 1. A picture taken by heliography; a photograph.
2. 2. An instrument for taking photographs of the sun.
3. 3. An apparatus for telegraphing by means of the sun's rays. See Heliotrope, 3.