heliograph|heliographs in English

noun

[he·li·o·graph || 'hɪːlɪəʊgræf /-grɑːf]

device for photographing the Sun; instrument which measures the intensity of sunlight; signaling device which reflects the sun's rays by means of a movable mirror; early type of photoengraving

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1. Obsolete names for Sun telescopes include heliograph and photoheliograph.

2. Actinometers, and Pyranometers (and signaling heliographs) Below are checklists of Sunshine recorders and solar-related instruments on postal items (stamps, …

3. In the modern era, semaphores and wireless solar telegraphs called heliographs were developed, using coded signals to communicate with their recipients.