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When vibrations of speech impinged upon the resonant surface its rhythmic light-vibrations were broken, just as a telephone transmitter breaks an electric current. Simultaneously these light-vibrations were changed into sound on the surfaces of all spheres tuned to that particular instrument.
"The material simply admits all light-vibrations, or perhaps curves them, just as the opacities cut them off," I answered. "A man under the X-ray is partly invisible; this makes him wholly so. He doesn't register, as the people of the motion-picture profession say." "Camouflage," repeated Larry. "And as for the Shining One Say!" he snorted. "I'd like to set the O'Keefe banshee up against it.
Though the discovery has not as yet borne fruit in any direct practical application, yet it has proved of immense value from a theoretical standpoint. In this investigation Faraday proved that light-vibrations are rotated by the action of a magnetic field. He employed the light of an ordinary Argand lamp, and polarized it by reflection from a glass surface.
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