chief, pivotal, early 14c., from Latin cardinalis principal, chief, essential, from cardo (genitive cardinis) that on which something turns or depends; pole of the sky, originally door hinge, of unknown origin. Related: Cardinally. The cardinal points (1540s) are north, south, east, west.
Twenty years after the telephone was invented and music was first sent down a telephone line, Guglielmo Marconi sent radio signals. Marconi (1874-1937) was born in Italy and studied at the University of Bologna.he next year Marconi opened the first radio factory in Chelmsford, Essex and established a radio link between Britain and France. A link with the USA was established in 1901.
Early Traces of Color Television. Well, early traces points to a German patent that was garnered in 1904. This was said to contain the first recorded proposal written for a color television. In 1928, Charles Jenkins receives the license for the first television station issued by the Federal Radio Commission.