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What was the bandwidth of an electric telegraph?

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An electrical telegraph is a telegraph that uses electrical signals, usually conveyed via dedicated telecommunication circuit or radio. The electrical telegraph, or more commonly just telegraph, superseded optical semaphore telegraph systems, thus becoming the first form of electrical telecommunications. read more

The electrical telegraph grew out of advances in electrical science between about 1800 and 1840, particularly the discovery of galvanic electricity by Luigi Galvani and the invention of the electrical battery by Alessandro Volta around 1800, and research into electromagnetism by Hans Christian Ørsted, Andre-Marie Ampère, Joseph Henry, and Michael Faraday during the 1820s and 1830s. read more

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