Heliograph
Heliograph (hē"li*o*grȧf) , noun
[Helio- + -graph.]
1.
A picture taken by heliography; a photograph.
2.
An instrument for taking photographs of the sun.
3.
An apparatus for telegraphing by means of the sun's rays. See Heliotrope, 3.
Heliograph (hē"li*o*grȧf) , transitive verb
1.
To telegraph, or signal, with a heliograph.
2.
To photograph by sunlight.