he·li·o·graph 
(hēlē-ə-grăf′)
(hēlē-ə-grăf′)n.
1. A device for transmitting messages by reflecting sunlight.
2. A device capable of imaging the surface and outer regions of the sun.
v. he·li·o·graphed, he·li·o·graph·ing, he·li·o·graphs
v.tr.
To send (a message) by heliograph.
v.intr.
To send a heliograph.
he′li·ogra·pher (-ŏgrə-fər) n.
he′li·o·graphic adj.
he′li·ogra·phy (-ŏgrə-fē) n.