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ОписаниеMarconi and his wireless apparatus 1897.jpg
English: Publicity photo in a magazine of British-Italian radio entrepreneur Guglielmo Marconi with his early wireless radiotelegraphy transmitter and receiver, invented around 1895. On the left is his spark gap transmitter, consisting of a dipole antenna made of two brass rods with a spark gap between them, which transmits pulses of radio waves spelling out text messages in Morse code. On the right is his receiver, consisting of a coherer which rings a bell when it receives the dots and dashes of Morse code The bell and batteries are in the box.
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Guglielmo Marconi with his first radio transmitter and receiver