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York City, and the lamp part at the other end, say in Detroit, you If you put the switch part at one end, say in New Suppose you could make an absolutely gigantic flashlight hundreds of Library of Congress, Prints and Photographs
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Or close to send messages coded as pulses of electricity.Īrtwork from Frank Leslie's Illustrated Newspaper, 1871, courtesy of The switch, you lower the drawbridge: you remove the break in theĬircuit, so electrons from the battery flow continuously around it, lighting theĪrtwork: Samuel Morse demonstrates his telegraph: essentially, an electric circuit you open The switch isĪ kind of "drawbridge" that stops current flowing. Light is off, the switch is set so it breaks the circuit. Linking together a lamp, a switch, and a battery. It's a very basic electrical circuit: a loop of cable The telegraph line as bursts of electricity. Messages could be sent back and forth down A telegraph was a simpleĮlectrical circuit stretching many miles between two towns, typicallyĪlongside a railroad line. Was the height of communication technology. The string has to be much tighter than I've drawn it here!īack in the 19th century, just before the telephone was invented,Īnother piece of electrical equipment called the telegraph They're in another building-or even another country-we need a differentĪrtwork: Tin can telephones send sounds as vibrations down the string that connects The person we want to talk to is sitting in the same room. Guitar string moving back and forth) to our eardrums. Normally, sounds travel through the air as invisible waves, You a great insight into how a telephone carries people's voices from It really does work! Not only that, it gives Out of two baked-bean cans and a length of string? Wherever they go, even from one country to another. Now phone numbers are linked not to places but to people, who take their phones and phone numbers Often you had to ask to speak to the person you wanted and wait while they walked to the phone. When you made a telephone call, the number you dialled reached a specific place Mobile cellphones became popular from the 1980s, were invariablyįixed in position. Photo: Telephones used to be cumbersome and expensive pieces of equipment and, until Telephones seem quite simple, but what exactly are they and how do they route our calls round Infrastructure on which the Internet is built. Send documents by fax and it's also the basic Apart from handling voice calls, it helps us Since that moment, a little over a centuryĪgo, the telephone has become one of the most commonplace Properly came into being, thanks to Watson's brilliant colleagueĪlexander Graham Bell (1847–1922). Made history: "Mr Watson! Come here! I want to see you!" Those three shortĮxclamations mark the moment when the telephone Piece of electrical apparatus when he heard it speak the words that
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On March 10, 1876, Thomas Watson was staring at a strange