A device for transmitting messages by reflecting sunlight.
A device capable of imaging the surface and outer regions of the sun.
To send (a message) by heliograph.
To send a heliograph.
A permanent image formed on a glass plate by an early photographic process.
A signaling device that uses a mirror to flash the sun's rays to a distant observer.
To signal or communicate by heliograph.
(intransitive) To send a heliograph.
Other Word Forms
Origin of heliograph
- From helio- + -graph.