IRVIN ESPINOSA BAÑOS INVENTED

THE RADIO

In 1887, Heinrich Hertz first detected radio waves. The sparks had been blowing through the air that separated two knobs of copper. The spark produced electromagnetic disturbances, or waves, that propagate as waves in water and produced a sizzling between two brass knobs were the ends of an open ring positioned at a distance of one meter. Using coherer, Oliver Lodge transmitted and received the first radio message in 1894. Groups of waves used to represent the dots and dashes of Morse code, which is already widely used in wire telegraphy. The transmission of voice messages through space was something still unimagined (although the phone already allowed to speak through electrically conductive), so the old radio was called wireless telegraphy. Around 1913 all the essential elements of the radio were invented. It could produce radio waves, mixed with the signals due to sound waves, amplify, transmit, detect and converted into sound waves. There was, however, serious technical problems, the pair that the inventors themselves were surprised by the huge distances they could cover the waves generated. Radio waves were used for telephony. The breakthrough came shortly after the end of World War I, when the public could receive and buy aparataos receivers used in war. Many people took the radio as a hobby and was to them that the Marconi Company conducted its first experimental radiotelephone transmission from Chelmsford, Essex, in 1919.