Radio Invented

In 1895, a young Italian experimenter named Guglielmo Marconi transmitted telegraph signals through the air without wires, over a distance of about a couple of kilometers, at his family's estate near Bologna. The achievement did not create radio from nothing, but it turned a laboratory curiosity into a practical means of communication. Within a few years, wireless telegraphy was reshaping shipping, journalism, and warfare, and it laid the groundwork for broadcasting.

The scientific foundations had been laid by others. In the 1860s James Clerk Maxwell predicted that electromagnetic waves could travel through space, and in the late 1880s Heinrich Hertz generated and detected them in his laboratory in Germany. Other researchers, including Oliver Lodge in Britain, Alexander Popov in Russia, and Jagadish Chandra Bose in India, explored detecting these waves, and Nikola Tesla in the United States worked on wireless transmission as well. Hertz himself saw little practical use for his discovery. Marconi, who was in his early twenties and largely self-taught, saw it as a possible replacement for the telegraph where cables could not reach, such as ships at sea.

Working with a spark transmitter, a coherer receiver, and a telegraph key, Marconi steadily extended the range of his signals. Accounts of the 1895 experiments describe a key moment when a signal was sent over a hill, showing that the waves were not limited to line of sight. Finding little interest from the Italian government, he moved to Britain in 1896, where he received a patent and the backing of the British Post Office. In 1897 he founded a company that became the Marconi Wireless Telegraph Company. Historians still debate how original his work was, since he combined and refined existing ideas, and patent disputes with Lodge, Tesla, and others continued for years.

Progress was rapid. In 1899 Marconi sent signals across the English Channel, and in December 1901 he reported receiving a transmission across the Atlantic, from Cornwall to Newfoundland. The claim was based on faint signals of the letter "S" and has been questioned by some historians, though later, better-documented transatlantic transmissions confirmed the principle.

The consequences were profound. Wireless sets became standard on ocean liners, and their value was dramatically shown in sea rescues, including after the sinking of the Titanic in 1912. Navies and armies adopted radio for command and coordination. Voice transmission, developed in the early twentieth century, led to commercial broadcasting in the 1920s. Marconi shared the 1909 Nobel Prize in Physics with Karl Ferdinand Braun, and the technology he popularized underlies modern radio, television, and mobile communication.