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Scientific American 1881-01-01

ScientificAmerican1881-01-01.jpg Saturday Evening Post 1909-05-29ThumbnailsScientific American 1881-06-18Saturday Evening Post 1909-05-29ThumbnailsScientific American 1881-06-18Saturday Evening Post 1909-05-29ThumbnailsScientific American 1881-06-18Saturday Evening Post 1909-05-29ThumbnailsScientific American 1881-06-18Saturday Evening Post 1909-05-29ThumbnailsScientific American 1881-06-18

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