heliogram

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heliogram

(ˈhiːlɪəʊˌɡræm)
n
(Navigation) a message sent using a heliograph
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.heliogram - a message transmitted by means of the sun's rays
message - a communication (usually brief) that is written or spoken or signaled; "he sent a three-word message"
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Oppenheim's ghostly heliograms and lunagrams on view are reproductions of nineteenth-century photographs of the sun and moon, developed by way of those very light sources and then treated with shimmery metallic tones.