Well, no one uses a telegraph in the 21st century. But some disadvantages were lack of direct communication. If you wanted to say something to a friend across the country you'd have to write it out with a stop at the end of a sentence instead of a period. Then you'd take it over to the town telegraph office where they'd translate it into Morse Code. No messages would be private, they'd have to be short, and they could only be sent during the telegraph office's business hours. Also it was unreliable, especially before Marconi invented wireless.
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telegraph changed to internet
Telegraph-Journal was created in 1862.
Yes a telegraph can be wireless. Thomas Edison invented the first wireless telegraph
The Barclay brothers puchased the Telegraph Group , which included the The Daily Telegraph, Sunday Telegraph and The spectator, from Hollinger in 2004.
The telegraph.
HOW THEY MADE A MORSE CODE MACHINE Samuel F.B. Morse and Alfred Vail developed an electric telegraph which sent pulses of electrical current to control an electromagnet that was located at the receiving end of the telegraph wire.
A telegraph circuit is an electrical circuit attached to a telegraph. This circuit is incomplete until the telegraph is connected, allowing for the Morse-code messages by tapping the circuit closed.
For Telegraph readers who are wishing to subscribe online to the Evening Telegraph they could subscribe by going to their local online Evening Telegraph website.
The telegraph is what ended the Pony Express
http://en.wikipedia.org/wiki/Telegraph
Telegraph poles to stop debris
It is a noun which can be used as an adjective: a telegraph pole.