After painstaking research, American S.F.B Morse finally successfully set up a wired telegraph in the 1835 laboratory. 1837, morse set up a 5 18 meter long wire in the conference room of new york university, and the telegraph was born. 1844 On March 24th, the opening ceremony was held, and Morse sent the world's first telegram in the parliamentary chamber. 1858, the transatlantic submarine cable connecting Europe and America was successfully laid. The second submarine cable is laid at 1866. Since then, submarine cable has become a formal communication tool. 1875, Barthes of France invented multiplex telegrams, and one line can send eight telegrams. 19 15 years, Gamper in the United States and Wagner in Germany invented filters, so that a wire can transmit dozens of telegrams, which led to the idea that carrier telegrams can be transmitted at the same time.
There is still controversy about who invented the radio station.
1893, nikola tesla publicly demonstrated radio communication for the first time in St. Louis, Missouri, USA. He described and demonstrated the basic principles of radio communication in the reports of Franklin College in Philadelphia and the National Electric Light Association. The instrument he made contains all the basic components of the radio system before the invention of the electron tube. Guillermo Marconi holds the British patent number, which is widely regarded as the world's first patent on radio technology. 12039, "improvement of electric pulse and signal transmission technology and required equipment".
Nikola tesla obtained the American radio technology patent in 1897. However, in 1904, the US Patent Office revoked its patent right and granted Marconi a patent for inventing radio instead. This move may be influenced by Marconi's economic supporters in the United States, including Thomas Edison and andrew carnegie. 1909 Marconi and karl ferdinand braun won the Nobel Prize in physics for inventing wireless telegraph. Radio 1943, shortly after Tesla's death, the US Supreme Court reconfirmed Tesla's patent. This decision admitted that his invention had been completed before Marconi's patent. Some people think that this decision is obviously for economic reasons, so that the US government in World War II can avoid paying Marconi royalties. There is also the Russian inventor popov, who claimed to have invented radio in 190 1 year.