The importance of the telegraph
The Importance of the Telegraph
The telegraph is an electromagnet connected to a battery via a switch. When the switch is down, the current flows from the battery through the key, down the wire, and into the sounder at the other end of the line. By itself, the telegraph could express only two states, on or off. This limitation was eliminated by the fact that it was the duration of the connection that determined the …
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…History of the Telegraph, www.allsands.com
The Library of Congress, Today in History, www.memory.loc.gov
References
Field, Alexander. "French Optical Telegraphy, 1793-1855: Hardware, Software, Administration." Technology and Culture 35 (1994): 315-47.
Nonnenmacher, Tomas. "History of the U.S. Telegraph Industry." EH.Net Encyclopedia, www.eh.net
The Household Cyclopedia of General Information, 1881, www.publicbookshelf.com
The History of the Telegraph, www.allsands.com
The Library of Congress, Today in History, www.memory.loc.gov
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