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.
Ham Radio History. In 1873, James Clerk Maxwell presented his theory of the electromagnetic field. In 1901 Guglielmo Marconi communicated across the Atlantic with a radio device using high power and giant antennas. To curb interference, Congress approved the Radio Act of 1912, which required amateurs to be licensed and restricted to the single wavelength of 200 meters.