Bell's telephone sketch. Drawing made by Alexander Graham Bell of his design for a telephone,comprising a mouthpiece (into which the user is speaking) and a speaker (centre right). Bell made the sketch in 1876,and his diagram reached the patent office just a few hours before the very similar telephone scheme of Elisha Gray. For Gray's sketch,see image H407/298 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library |
Taille de l’image : | 5164 px × 3468 px |
Model Release : | Non requis |
Property Release : | Non requis |
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