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  2. Electrical telegraph - Wikipedia

    en.wikipedia.org/wiki/Electrical_telegraph

    The one-needle telegraph proved highly successful on British railways, and 15,000 sets were in use at the end of the nineteenth century; some remained in service in the 1930s. [42] The Electric Telegraph Company, the world's first public telegraphy company, was formed in 1845 by financier John Lewis Ricardo and Cooke. [43] [44]

  3. Georges-Louis Le Sage - Wikipedia

    en.wikipedia.org/wiki/Georges-Louis_Le_Sage

    Georges-Louis Le Sage (French: [lə saʒ]; 13 June 1724 – 9 November 1803) was a Genevan physicist and is most known for his theory of gravitation, for his invention of an electric telegraph and his anticipation of the kinetic theory of gases.

  4. David Alter - Wikipedia

    en.wikipedia.org/wiki/David_Alter

    In 1836 Elderton, David Alter invented the electric telegraph, one year before the popular Morse telegraph was invented. David rigged the telegraph between his house and his barn. He was interviewed about the discovery going unobserved by other inventors and said: "I may say that there is no connection at all between the telegraph of Morse and ...

  5. André-Marie Ampère - Wikipedia

    en.wikipedia.org/wiki/André-Marie_Ampère

    The SI unit of electric current, the ampere (A), is named after him. His name is also one of the 72 names inscribed on the Eiffel Tower. The term kinematic is the English version of his cinématique, [3] which he constructed from the Greek κίνημα kinema ("movement, motion"), itself derived from κινεῖν kinein ("to move"). [4] [5]

  6. Charles Wheatstone - Wikipedia

    en.wikipedia.org/wiki/Charles_Wheatstone

    Sir Charles Wheatstone (/ ˈ w iː t s t ə n /; [1] 6 February 1802 – 19 October 1875) was an English physicist and inventor best known for his contributions to the development of the Wheatstone bridge, originally invented by Samuel Hunter Christie, which is used to measure an unknown electrical resistance, and as a major figure in the development of telegraphy.

  7. Telegraphy - Wikipedia

    en.wikipedia.org/wiki/Telegraphy

    According to Morse, telegraph dates only from 1832 when Pavel Schilling invented one of the earliest electrical telegraphs. [3] A telegraph message sent by an electrical telegraph operator or telegrapher using Morse code (or a printing telegraph operator using plain text) was known as a telegram.

  8. Cooke and Wheatstone telegraph - Wikipedia

    en.wikipedia.org/wiki/Cooke_and_Wheatstone_telegraph

    The Cooke and Wheatstone telegraph was an early electrical telegraph system dating from the 1830s invented by English inventor William Fothergill Cooke and English scientist Charles Wheatstone. It was a form of needle telegraph , and the first telegraph system to be put into commercial service.

  9. Timeline of the telephone - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_the_telephone

    1844: Innocenzo Manzetti first suggests the idea of an electric "speaking telegraph", or telephone. 1849: Antonio Meucci demonstrates a communicating device to individuals in Havana. It is disputed that this is an electromagnetic telephone, but it is said to involve direct transmission of electricity into the user's body.