write an essay in hindi about cutting wires and cables of telephone in wartime in India during dhanpur laskar time
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write an essay in hindi about cutting wires and cables of telephone in wartime in India during dhanpur laskar time.
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Telegraphy is the long-distance transmission of textual 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 and such systems are thus not true telegraphs.
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