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1897 __ Radio and wireless experiments
Guglielmo Marconi (1874-1937)
Comment : Marconi gained the interest and support of William Preece, the Chief Electrical Engineer of the British Post Office, and demonstrated wireless transmissions on Salisbury Plain and across the Severn Estuary. He presented lectures in London, such as "Telegraphy without Wires" at the Toynbee Hall in December 1896, and "Signalling through Space without Wires", given to the Royal Institute in June 1897. He did demonstrate his wireless technology in La Spezia back in Italy, but in November, 1897, Marconi's first permanent transmitting station was erected at The Needles, near Alum Bay on the Isle of Wight in the south of England.March 1897.A wireless signal travels across Salisbury Plain in Britain. 5 km.May 1897.The first over-water wireless signal cross the Bristol Channel, Britain. 14 km.July 1897.La Spezia, Italy, sees the first wireless signal sent over the visible horizon. 18 km. Guglielmo Marconi succeeds in establishing in La Spezia, Italy a radio session (using Morse code) spanning a distance of 18 km between an arsenal and the battleship 'San Martino', in July 1897. (Brunero, Angelo and Andrea Valori. 2001, “The invention of the radio”)October 1897.A wireless message travels from Salisbury to Bath in Britain. 54km.For the record, Marconi also demonstrated his wireless transmissions in Ireland, with a test for Lloyds taking place in May 1898, transmitting between Ballycastle and Rathlin Island.December 1898.A ship in the English Channel sends the first ship-to-shore signal to Dover. 19 km.March 1899.The first international wireless message is sent from France to Britain, from Boulogne to Dover. 56 km.February 1900.During the Boer War, ship-to-ship commuinication in Delagoa Bay, Mozambique, is the first wartime use of wireless telegraphy. 80 km.In January 1901 the station at Poldhu was set up and received their first radio message from the Isle of Wight, operating at 1.7MHz.July 1901.A wireless signal travels from Poldhu, Britain, to Crookhaven, Ireland. 360 km.December 1901.A station in St. John's, Newfoundland, detects the first transatlantic wireless message from Poldhu, Britain. 2880 km. The first transatlantic morse message by radio was claimed to be transmitted in December 1901 from Poldhu, to St John's in Newfoundland, 2100miles away, where Marconi claimed to have heard the signal using a kite-supported 400foot receiver antenna. It was a repeated "S", 3 dots in morse code, in the daytime, not independently verified, and very similar to the static noise.Marconi sailed from the UK to the USA on the SS Philadelphia in 1902, recording signals sent from the Poldhu station. Signals were received at up to 2099miles, but only at night, when the reception was much better: in the daytime 700miles was the maximum range achieved.December 1902.Signals travel between Poldhu and Cape Breton, Nova Scotia, Canada, in the first two-way, transatlantic wireless communication. 2880 km.Later, a message from Roosevelt to King Edward VII was reputed to be the first message transmitted from the USA to Europe, sent to Poldhu in January 1903, but although a regular transatlantic telegraph service did start in 1907, it was very intermittent.August 1910.The first pilot to transmit an air-to-ground message doest so over Long Island in the United States of America.June 1910.A wireless message from Buenos Aires, Argentina, to Clifden, Ireland, travels 6400 km. (Compiled from various sources)
Urls : http://www.cisi.unito.it/marconi/radeng.html (last visited ) http://www.fi.edu/learn/case-files/marconi/map.html (last visited )

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