How to use a telephone illustration

Numéro d’image : 11960098
How to use a telephone illustration
19th century illustration of the proper use of a Bell telephone,where the microphone and speaker are separate devices. A telephone converts sound,typically and most efficiently the human voice,into electronic signals suitable for transmission via cables or other transmission media over long distances,and replays such signals simultaneously in audible form to its user. In 1876,Scottish emigrant Alexander Graham Bell was the first to be granted a United States patent for a device that produced clearly intelligible replication of the human voice. This instrument was further developed by many others. The telephone was the first device in history that enabled people to talk directly with each other across large distances. Telephones rapidly became indispensable to businesses,government,and households,and are today some of the most widely used small appliances
Licence : Droits gérés
Crédit: Science Photo Library / Parker, David
Taille de l’image : 5943 px × 5874 px
Model Release : Non requis
Property Release : Non requis
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