Heliograph

usgb/ˈhiːliəɡræf/
noun

A device that uses sunlight to send signals by flashing light in Morse code.

The explorers used a heliograph to send an SOS signal from the remote island.
Visual representation of "heliograph" - A device that uses sunlight to send signals by flashing light in Morse code.

Often appears as...

  • use a heliograph
  • heliograph signal
Definition 1 of 2
Visual representation of "heliograph"
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Historical Device

The heliograph was vital for long-distance communication before modern technology.

Illustration for Historical Device
Old military camps sometimes display a heliograph in their museums.
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Visual Signaling

A heliograph required a clear, sunny day to be effective in sending messages.

Illustration for Visual Signaling
The heliograph remained idle on the foggy mornings, as no light could be seen.
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Requires Skill

Operating a heliograph needed knowledge of Morse code and precise timing.

Illustration for Requires Skill
He practiced for weeks to become adept at using the heliograph.
Visual representation of the word "Heliograph"

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