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Tarr, Joel A., Thomas Finholt, and David Goodman. "The city and the telegraph: urban telecommunications in the pre-telephone era." Journal of Urban History 14.1 (1987): 38–80. Thompson, Robert Luther. Wiring a Continent: The History of the Telegraph Industry in the United States, 1832-1866 (1947) ends in 1866; emphasis on Western Union online
The first transcontinental telegraph (completed October 24, ... The entire cost of the system was half a million dollars (equivalent to $17 million in 2023).
Cooke and Wheatstone's five-needle telegraph from 1837 Morse telegraph Hughes telegraph, an early (1855) teleprinter built by Siemens and Halske. Electrical telegraphy is a point-to-point text messaging system, primarily used from the 1840s until the late 20th century.
The condenser telephone, also known as the Phonopore telephone system, was an invention first patented in 1892 and subsequently introduced in many countries in large numbers, whereby telephone voice communications could be made over existing Morse code telegraph infrastructure at a low installation and running cost.
The electric telegraph was slower to develop in France due to the established optical telegraph system, but an electrical telegraph was put into use with a code compatible with the Chappe optical telegraph. The Morse system was adopted as the international standard in 1865, using a modified Morse code developed in Germany in 1848. [1]
When the Massachusetts 911 system for emergency calls stopped working on Tuesday afternoon, Boston Police Commissioner Michael Cox noted the city already had a backup solution in place: The telegraph.
1871: Practical duplex telegraphy system, allowing two messages to be sent over wire at the same time, one in each direction. 1872: Dallas, Texas reached by telegraph line. [115] October 1872: Australia is linked to the world system by a submarine telegraph line between Darwin and the Dutch East Indies (Indonesia).
Developed beginning in the 1830s, a telegraph line was a person-to-person text message system consisting of multiple telegraph offices linked by an overhead wire supported on telegraph poles. To send a message, an operator at one office would tap on a switch called a telegraph key , creating pulses of electric current which spelled out a ...