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Signature. Marshal Cândido Mariano da Silva Rondon (5 May 1865 – 19 January 1958) was a Brazilian military officer most famous for his telegraph commission and exploration of Mato Grosso and the western Amazon basin, as well as his lifelong support for Indigenous Brazilians. He was the first director of Brazil's Indian Protection Service or ...
The Roosevelt–Rondon Scientific Expedition (Portuguese: Expedição Científica Rondon–Roosevelt) was a survey expedition in 1913–14 to follow the path of the Rio da Dúvida ("River of Doubt") in the Amazon basin. The expedition was jointly led by Theodore Roosevelt, the former president of the United States, and Colonel Cândido Rondon ...
1 May 1844: Test of line conveys news of the Whig Party's nomination of Henry Clay for U.S. President from the party's convention in Baltimore to the Capitol Building in Washington. 24 May 1844: Morse's first message over the Baltimore-Washington telegraph line, "What hath God wrought!" is transmitted, chosen from the Bible for Morse by Annie G ...
The first transcontinental telegraph (completed October 24, 1861) was a line that connected the existing telegraph network in the eastern United States to a small network in California, by means of a link between Omaha, Nebraska and Carson City, Nevada, via Salt Lake City. It was a milestone in electrical engineering and in the formation of the ...
Building of line. In March 1843, the US Congress appropriated US$30,000 (equivalent to $981,000 in 2023) to Samuel Morse to lay a telegraph line between Washington, D.C., and Baltimore, Maryland, along the right-of-way of the Baltimore and Ohio Railroad. Morse originally decided to lay the wire underground, asking Ezra Cornell to lay the line ...
Earth-return telegraph. Earth-return telegraph is the system whereby the return path for the electric current of a telegraph circuit is provided by connection to the earth through an earth electrode. Using earth return saves a great deal of money on installation costs since it halves the amount of wire that is required, with a corresponding ...
Painting of Men Working On the Collins Overland Telegraph Line, by John Clayton White.. The Russian–American Telegraph, also known as the Western Union Telegraph Expedition and the Collins Overland Telegraph, was an attempt by the Western Union Telegraph Company from 1865 to 1867 to lay a telegraph line from San Francisco, California, to Moscow, Russia.
The Atlantic Telegraph Company led by Cyrus West Field constructed the first transatlantic telegraph cable. [1] The project began in 1854 with the first cable laid from Valentia Island off the west coast of Ireland to Bay of Bulls, Trinity Bay, Newfoundland. The first communications occurred on August 16, 1858, but the line speed was poor.