Heliograph
/ˈhiːliəɡræf/
Definition 1 of 2
Pro Tip 1/3Historical Device
The heliograph was vital for long-distance communication before modern technology.
Old military camps sometimes display a heliograph in their museums.
Pro Tip 2/3Visual Signaling
A heliograph required a clear, sunny day to be effective in sending messages.
The heliograph remained idle on the foggy mornings, as no light could be seen.
Pro Tip 3/3Requires Skill
Operating a heliograph needed knowledge of Morse code and precise timing.
He practiced for weeks to become adept at using the heliograph.
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