ScientificAmerican1881-01-01.jpg Scientific American 1880-12-25ThumbnailsScientific American 1881-01-08Scientific American 1880-12-25ThumbnailsScientific American 1881-01-08Scientific American 1880-12-25ThumbnailsScientific American 1881-01-08Scientific American 1880-12-25ThumbnailsScientific American 1881-01-08Scientific American 1880-12-25ThumbnailsScientific American 1881-01-08

Bell's photophone. The articulating photophone -- the transmitter; the selenium receiver.



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

Restoration by: magscanner