heliograph
/'hi:liougrɑ:f/
Học thuậtThân thiện
Definition
Noun:
- A signaling device: An apparatus for sending telegraphic messages over long distances using sunlight. It operates by using a mirror to reflect the sun's rays, turning the beam on and off to transmit signals in Morse code or a similar system.
- A scientific instrument: A device used for photographing or recording the sun.
Verb:
- To signal using sunlight: To send a message or signal over a distance by manipulating a mirror to reflect flashes of sunlight.
Examples
Noun:
- The army used a heliograph to communicate between the two mountain outposts.
- The astronomer adjusted the heliograph to capture a detailed image of the solar surface.
Verb:
- The stranded hikers attempted to heliograph a rescue signal to a passing aircraft.
- Messages were heliographed across the desert during the military campaign.
Advanced Usage
- Historical context: The heliograph was a crucial tool for military and exploratory communication before the widespread adoption of radio, especially in open, sunny terrain.
- Heliograph stations formed a vital communication network across the British Empire's arid colonies.
Variants and Related Words
- Heliography (n): The process or technique of signaling or photographing using sunlight.
- Heliographic (adj): Relating to a heliograph or heliography.
- The heliographic records provided valuable data on sunspot activity.
Synonyms
- Noun (for signaling): Sun telegraph, signal mirror.
- Verb: Flash, signal, reflect.
Related Phrases
- To send a heliograph: To transmit a message using a heliograph.
- The scout was ordered to send a heliograph to headquarters.
Related Idioms
- To heliograph an idea: To make an idea very clear and visible to all, akin to a bright flash of light.
- Her groundbreaking research heliographed a new path for the entire field.
Noun
- an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on
Verb
- signal by means of a mirror and the using the sun's rays