Found 2 items, similar to heliograph.
English → English (WordNet) Definition: heliograph heliograph n : an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on v : signal by means of a mirror and the using the sun's rays
English → English (gcide) Definition: Heliograph Heliograph \He"li*o*graph\ (h[=e]"l[i^]*[-o]*gr[.a]f), n. [Helio- + -graph.] [1913 Webster] 1. A picture taken by heliography; a photograph. [1913 Webster] 2. An instrument for taking photographs of the sun. [1913 Webster] 3. An apparatus for telegraphing by means of the sun's rays. See Heliotrope, 3. [1913 Webster] Heliograph \He"li*o*graph\ (h[=e]"l[i^]*[-o]*gr[.a]f), v. t. 1. To telegraph, or signal, with a heliograph. [Webster 1913 Suppl.] 2. To photograph by sunlight. [Webster 1913 Suppl.]