Inside Out Library · Explore
Scientific American, Vol. 44, No. 1 (January 1881) (1881)
leaf 1
ce and dependence for their production on the light light from the sun or from a powerful artificial source, such the telephone, there are instruments of different de- the listener may satisfy himself by cutting off the light at grees of perfection. The any moment with the little opaque disk fixed… … transmitter, shown again in made hitherto with articu- [Continued on page 4.] late speech the instruments Fig. 6. -THE ARTICULATING PHOTOPHONE-THE SELENIUM RECEIVER. © 1881 SCIENTIFIC AMERICAN, INCPatents · Patented · Improved · Selenium · Consists · Scientific American · Waste water · Induction coil · Wood working · Reissued letters · Original patent · Inexplosive porous · Trade mark · Letters patent · Patent issued
Internet Archive · Public domain (published before 1931). Free to use for anything.
More pictures from Scientific American, Vol. 44, No. 1 (January 1881)
More like this
