ScientificAmerican1881-06-18.jpg Scientific American 1881-06-11ThumbnailsScientific American 1881-06-25Scientific American 1881-06-11ThumbnailsScientific American 1881-06-25Scientific American 1881-06-11ThumbnailsScientific American 1881-06-25Scientific American 1881-06-11ThumbnailsScientific American 1881-06-25Scientific American 1881-06-11ThumbnailsScientific American 1881-06-25

Professor A. E. Dolbear's new telephonic system.



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

Restoration by: magscanner