Example image of eyePlorer eyePlorer map for 'Telegraphy': Greek language Radio Wireless telegraphy Computer network Data E-mail Fax Public switched telephone network Electrical telegraph Continuous wave Spark-gap transmitter Morse code Printing telegraph Teleprinter Bell Labs Beacon Flag semaphore Heliograph Semaphore line Signal lamp Smoke signal Claude Chappe Napoleon I of France Prussian semaphore system Post riders Incandescent light bulb New Jersey PNC Bank Arts Center Telegraph Hill, San Francisco Germans Països Catalans Polymath Samuel Thomas von Sömmerring Baud Pavel Schilling Carl Friedrich Gauss Göttingen Wilhelm Eduard Weber Charles Wheatstone Great Western Railway United Kingdom of Great Britain and Ireland William Fothergill Cooke London Paddington station West Drayton Patent United Kingdom Alexander Bain (inventor) Giovanni Caselli Pantelegraph Paris