A person who operates a heliograph or sends messages using this sun-reflection signaling device.
From 'heliograph' + '-er' (one who performs an action). The term specifically refers to skilled operators trained during the height of heliograph use in the 19th and early 20th centuries.
Heliographers were like the texters of their era—they had to memorize Morse code and coordinate perfectly with distant operators, all while aiming mirrors at the sun without going blind!
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