ScientificAmerican1894-02-03.jpg Scientific American 1892-03-26ThumbnailsScientific American 1894-02-24Scientific American 1892-03-26ThumbnailsScientific American 1894-02-24Scientific American 1892-03-26ThumbnailsScientific American 1894-02-24Scientific American 1892-03-26ThumbnailsScientific American 1894-02-24Scientific American 1892-03-26ThumbnailsScientific American 1894-02-24
Details of construction of the Bell telephone. Single wire circuit. Metallic circuit.



Source: Steve Kirch, collector, and creator of a great website about SCIENTIFIC AMERICAN in the past

Restoration by: magscanner