Vocabulary Entry

heliograph

|noun • verb

noun

A device used for signaling using sunlight reflected from a mirror.

Example Sentences

"The heliograph transmitted a message across the vast desert."

"During the military exercises, they used a heliograph to communicate without radio."

"Early explorers relied on the heliograph for long-distance communication."

verb

Example Sentences

"They heliographed their position back to headquarters."

"In the climb, the mountaineers heliographed their safe arrival."

"He learned to heliograph messages during his time in the scouts."