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Heliograph

usgb/ˈhiːliəɡræf/Volume
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Historical DevicePlay
The heliograph was vital for long-distance communication before modern technology. SlideOld military camps sometimes display a heliograph in their museums.
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Visual SignalingPlay
A heliograph required a clear, sunny day to be effective in sending messages. SlideThe heliograph remained idle on the foggy mornings, as no light could be seen.
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Requires SkillPlay
Operating a heliograph needed knowledge of Morse code and precise timing. SlideHe practiced for weeks to become adept at using the heliograph.
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