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Early Telephone Switchboard, 1878

A telephone switchboard is a telecommunications system used in the public switched telephone network or in enterprises to interconnect circuits of telephones to establish telephone calls between the subscribers or users, or between other exchanges. The switchboard was an essential component of a manual telephone exchange, and was operated by one or more persons, called operators who either used electrical cords or switches to establish the connections. The electromechanical automatic telephone exchange, invented by Almon Strowger in 1888, gradually replaced manual switchboards in central telephone exchanges starting in 1919 when the Bell System adopted automatic switching.
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Titre:
Early Telephone Switchboard, 1878
Légende: Voir la traduction automatique
A telephone switchboard is a telecommunications system used in the public switched telephone network or in enterprises to interconnect circuits of telephones to establish telephone calls between the subscribers or users, or between other exchanges. The switchboard was an essential component of a manual telephone exchange, and was operated by one or more persons, called operators who either used electrical cords or switches to establish the connections. The electromechanical automatic telephone exchange, invented by Almon Strowger in 1888, gradually replaced manual switchboards in central telephone exchanges starting in 1919 when the Bell System adopted automatic switching.
Crédit:
Album / Science Source / New York Public Library
Autorisations:
Modèle: Non - Propriété: Non
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Taille de l'image:
2400 x 5373 px | 36.9 MB
Taille d'impression:
20.3 x 45.5 cm | 8.0 x 17.9 in (300 dpi)
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