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What it is?
Telegraphy (from Ancient Greek: τῆλε, têle, "at a distance" and γράφειν, gráphein, "to write") is the long-distance transmission of textual or symbolic (as opposed to verbal or audio) messages without the physical exchange of an object bearing the message. Thus semaphore is a method of telegraphy, whereas pigeon post is not.In the 19th century, the harnessing of electricity led to the invention of electrical telegraphy. -
Who invent it and when?
The first commercial telegraph was by Cooke and Wheatstone which followed their English patent of 10 June 1837 and demonstration on the London and Birmingham Railway in July. It provided signalling on a section of the Great Western Railway between London Paddington station and West Drayton in July 1839. However, in trying to get railway companies to take up his telegraph more widely for railway signalling, -
Evolution
In the 19th century, the harnessing of electricity led to the invention of electrical telegraphy. The advent of radio in the early 20th century brought about radiotelegraphy and other forms of wireless telegraphy. In the Internet age, telegraphic means developed greatly in sophistication and ease of use, with natural language interfaces that hide the underlying code, allowing such technologies as electronic mail and instant messaging. -
how does it work?
It is moved by means of trailing rollers, moved by a clockwork mechanism, on a cylinder impregnated with ink, in such a way that, depending on the duration of the pulsation of the switch, it will result in the printing of a point or a strip on the strip of ink. -
