telegraphy
Sign in to saveright|upright=0.9|thumb|Replica of a Chappe telegraph on the Litermont near [[Nalbach, Germany]]
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Article
27 sectionsContents
- 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.