Heliograph
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.
Often appears as...
- use a heliograph
- heliograph signal
noun
A machine for photographing the sun.
Astronomers use a heliograph to study the sun's activity.
Often appears as...
- use a heliograph
- heliograph images
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.
Often appears as...
- use a heliograph
- heliograph signal
noun
A machine for photographing the sun.
Astronomers use a heliograph to study the sun's activity.
Often appears as...
- use a heliograph
- heliograph images
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.
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.
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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