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  2. Telegraph process - Wikipedia

    en.wikipedia.org/wiki/Telegraph_process

    It models burst noise (also called popcorn noise or random telegraph signal). If the two possible values that a random variable can take are c 1 {\displaystyle c_{1}} and c 2 {\displaystyle c_{2}} , then the process can be described by the following master equations :

  3. Telegrapher's equations - Wikipedia

    en.wikipedia.org/wiki/Telegrapher's_equations

    The telegrapher's equations (or just telegraph equations) are a set of two coupled, linear equations that predict the voltage and current distributions on a linear electrical transmission line. The equations are important because they allow transmission lines to be analyzed using circuit theory . [ 1 ]

  4. Telegraphy - Wikipedia

    en.wikipedia.org/wiki/Telegraphy

    The word telegraph (from Ancient Greek: τῆλε 'at a distance' and γράφειν 'to write') was coined by the French inventor of the semaphore telegraph, Claude Chappe, who also coined the word semaphore. [2] A telegraph is a device for transmitting and receiving messages over long distances, i.e., for telegraphy.

  5. Transmission line - Wikipedia

    en.wikipedia.org/wiki/Transmission_line

    The telegrapher's equations (or just telegraph equations) are a pair of linear differential equations which describe the voltage and current on an electrical transmission line with distance and time. They were developed by Oliver Heaviside who created the transmission line model , and are based on Maxwell's equations .

  6. Optical communication - Wikipedia

    en.wikipedia.org/wiki/Optical_communication

    A replica of a Chappe telegraph tower (18th century). A 'semaphore telegraph', also called a 'semaphore line', 'optical telegraph', 'shutter telegraph chain', 'Chappe telegraph', or 'Napoleonic semaphore', is a system used for conveying information by means of visual signals, using towers with pivoting arms or shutters, also known as blades or paddles.

  7. Category:Telegraphy - Wikipedia

    en.wikipedia.org/wiki/Category:Telegraphy

    History of the telegraph (1 C, 17 P) I. Internet (27 C, 19 P) M. Morse code (28 P) T. Telegrams (17 P) Telegraphists (1 C, 41 P) Pages in category "Telegraphy"

  8. Telegraph key - Wikipedia

    en.wikipedia.org/wiki/Telegraph_key

    a Wright Brothers telegraph key (missing its knob) A Morse Key from G. Hasler, Bern (1900) first used by Gotthard Railway A telegraph key, clacker, tapper or morse key is a specialized electrical switch used by a trained operator to transmit text messages in Morse code in a telegraphy system. [1]

  9. Electrical telegraph - Wikipedia

    en.wikipedia.org/wiki/Electrical_telegraph

    The Electric Telegraph: A Social and Economic History. David and Charles. ISBN 0-7153-5883-9. OCLC 655205099. Mercer, David, The Telephone: The Life Story of a Technology, Greenwood Publishing Group, 2006 ISBN 031333207X; Schwoch, James (2018). Wired into Nature: The Telegraph and the North American Frontier. University of Illinois Press.