Telegraphy

Guglielmo Marconi radio-telegrph [|Guglielmo Marconi], anItalian inventor, provedthefeasibility of radio communication. He sent and receivedhisfirst radio signal in Italy in 1895. By 1899 he flashedthefirstwirelesssignalacrossthe English Channel and twoyearslaterreceivedtheletter "S", telegraphedfromEnglandtoNewfoundland. Thiswasthefirstsuccessfultransatlanticradiotelegraphmessage in 1902.

Growth of Radio - Radiotelegraph and Spark-Gap Transmitters Radio -telegraphyisthesendingby radio wavesthesamedot-dashmessage (morse code) used in a  [|telegraph]. Transmitters at that time werecalledspark-gap machines. Itwasdevelopedmainlyforship-to-shore and ship-to-shipcommunication. Thiswas a way of communicatingbetweentwopoints, however, itwasnotpublic radio broadcasting as weknowittoday. Wirelesssignalsprovedeffective in communicationforrescueworkwhen a sea disasteroccurred. A number of oceanlinersinstalledwirelessequipment. In 1899 theUnitedStatesArmyestablishedwirelesscommunicationswith a lightship off Fire Island, New York. TwoyearslatertheNavyadopted a wirelesssystem. Up tothen, theNavyhadbeenusing visual signaling and homingpigeonsforcommunication. By Ana lucia madrid