Early technology and the development of radio: the telegraph is the precursor of radio technology. Invented in the 1840s: morse code: a series of dots and dashes that stood for letters in the alphabet invented by samuel morse, by 1844, morse had set up the first telegraph line between. Washington dc and baltimore: by 1866, the first transatlantic cable, capable of transmitting about six words a minute, ran between newfoundland and ireland along the ocean floor, maxwell and hertz discover radio waves. The key development in wireless transmissions came from. James maxwell, a scottish physicist who in the mid-1860s theorized the existence of electromagnetic waves: invisible electronic impulses similar to visible light. Radio waves can be harnessed so that signals can be sent from a transmission point to a reception point. Heinrich hertz proved maxwell"s theories in the 1880s: marconi and the inventors of wireless telegraphy.