telegraphy

Also known as telegraph

right|upright=0.9|thumb|Replica of a Chappe telegraph on the Litermont near [[Nalbach, Germany]]

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Wikidata facts

Image: PSM V09 D091 Morse key and register.jpg

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Commons category: Telegraphy
Commons gallery: Teleprinter

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~51 min read

Article

27 sections

Contents

Terminology
History
Early signalling
Optical telegraph
Electrical telegraph
Railway telegraphy
Wigwag
Heliograph
Teleprinter
Automated punched-tape transmission
Oceanic telegraph cables
Facsimile
Wireless telegraphy
Non-radio wireless telegraphy
Ground, water, and air conduction
Electrostatic and electromagnetic induction
Telegram services
Telex
Decline
Social implications
In popular culture
Newspaper names
See also
References
Further reading
Technology
External links

right|upright=0.9|thumb|Replica of a Chappe telegraph on the Litermont near [[Nalbach, Germany]]

Telegraphy is the long-distance transmission of messages where the sender uses symbolic codes, known to the recipient, rather than a physical exchange of an object bearing the message. Thus flag semaphore is a method of telegraphy, whereas pigeon post is not. Ancient signalling systems, although sometimes quite extensive and sophisticated as in China, were generally not capable of transmitting arbitrary text messages. Possible messages were fixed and predetermined, so such systems are thus not true telegraphs.