Today in History – December 12, 1901 – Marconi sends first transatlantic radio signal. Guglielmo Marconi and his assistant, George Kemp heard the faint clicks of Morse code this day, signifying the first reception of transatlantic radio signals. This experiment in “wireless telegraphy” at a global dimension eventually transformed radio into a major form of communication in the twentieth century. Photo citation (left): Guglielmo Marconi with his assistant George Kemp pictured with a 10-inch induction coil spark transmitter and a Morse inker during the 1901 transatlantic test at Signal Hill. Center photo: Marconi’s antenna system at Poldhu, Cornwall. Right photo: BBC article and audio file.
Also on this date, Tide detergent introduced by Proctor and Gamble in 1946, the U.S. copyright law amended to include computer programs in 1980, and first prototype of hovercraft patented by British Engineer Christoper Cockerell in 1955.