Mid 19th Century global telegraph lines

Numéro d’image : 11904538
Mid 19th Century global telegraph lines
Mid 19th Century global telegraph lines. Map of the world with coloured lines depicting the stages at which people were laying down cables for electromagnetic telegraph links. The green lines show the cables in operation,the red ones show those under contract and the blue lines show the contemplated telegraph links. These cables transmit messages in the form of electrical signals around the world. Electric telegraphs were an important application of the newly-discovered electromagnetic force. The first practical telegraph was invented by Samuel Morse in 1837. They quickly spread across the USA and Europe,and revolutionised communications. The two continents were permanently linked in 1866 by an underwater cable crossing the Atlantic Ocean
Licence : Droits gérés
Crédit: Science Photo Library / Library of Congress
Taille de l’image : 6200 px × 4064 px
Model Release : Non requis
Property Release : Non requis
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