bn:00043584n
Noun Concept
Categories: Optical communications, History of telecommunications, Telegraphy, Semaphore
EN
heliograph  heliography  Solar signal
EN
An apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on WordNet 3.0
English:
messaging
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EN
An apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on WordNet 3.0 & Open English WordNet
A heliograph is a semaphore system that signals by flashes of sunlight reflected by a mirror. Wikipedia
A device used for optical signalling Wikipedia Disambiguation
communication device reflecting sunlight Wikidata
An apparatus for signalling by means of a moveable mirror which reflects flashes of sunlight. Wiktionary
WordNet 3.0 & Open English WordNet
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