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photophone

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Photophone - Wikipedia
The photophone is a telecommunications device that allows transmission of speech on a beam of light. It was invented jointly by Alexander Graham Bell and his ... en.wikipedia.org
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Alexander Graham Bell's Photophone: An Invention Ahead of Its Time
Alexander Graham Bell transmitted the first wireless telephone message on his newly invented "photophone," a device that allowed for the transmission of sound ... www.thoughtco.com
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Today in History - June 3 - The Library of Congress
The photophone functioned similarly to the telephone, except that the photophone used light as a means of projecting the information and the telephone ... www.loc.gov
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photophone
photophone (ˈfəʊtəʊfəʊn) [f. Gr. ϕῶς light, photo- + -ϕωνος sounding, sounder, ϕωνή voice, sound.] Any apparatus in which sounds are transmitted by light; esp. that invented by A. Graham Bell and Sumner Tainter in 1880, by means of which sound-vibrations are conveyed to a distance by means of a beam... Oxford English Dictionary
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The Photophone - Scientific American
The apparatus used to give the required undulatory character to light consists of a fiexible mirror of silvered mica or thin glass. The speaker's voice is ... www.scientificamerican.com
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Transmitting Sound using Sunlight - The Photophone - YouTube
How to make a photophone to transmit sound using sunlight. This invention by Alexander Graham Bell works by reflecting sunlight off a mirror ... www.youtube.com
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DIY Photophone (transmit Sound Over a Beam of Light) - Instructables
In this instructable I'm gonna show you how to make a photophone with a slightly modern twist, I'm also gonna show you how to send sound via light and how to ... www.instructables.com
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PHOTOPHONE Definition & Meaning - Merriam-Webster
a device whereby a sound signal (as a voice) is transmitted by causing it to modulate a beam of visible or infrared light which is received by a photoelectric ... www.merriam-webster.com
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The Photophone | Nature
In “the photophone” the varying of the intensity of the beam of light thrown on the receiving instrument is accomplished by the simple and ingenious means. www.nature.com
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RCA Photophone - Wikipedia
RCA Photophone was an optical sound, "variable-area" film exposure system, in which the modulated area (width) corresponded to the waveform of the audio signal. en.wikipedia.org
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what is a photophone
The photophone is a telecommunications device that allows transmission of speech on a beam of light. Bell believed the photophone was his most important invention.
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RCA Photophone
In April 1928, RCA Photophone Inc. was created as a subsidiary of RCA (itself then a GE subsidiary) to commercially exploit the Photophone system. Photophone brand abandoned The re-use of the Photophone brand was relatively short-lived. wikipedia.org
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thermophone
thermophone (ˈθɜːməʊfəʊn) [f. as prec. + Gr. ϕωνή voice, sound, after telephone.] An apparatus in which sonorous vibrations of a diaphragm are produced by heat-rays.1878 Th. Wiesendanger in Engineer XLVI. Nov. 335 The Thermophone. A new source of sound for the telephone. 1881 A. G. Bell in Nature 12... Oxford English Dictionary
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Pallophotophone
The RCA Photophone sound-on-film system for motion pictures was later derived from it. It was marketed by RCA (then a GE subsidiary) as RCA Photophone. wikipedia.org
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Roberto Landell de Moura
working of the Photophone, we can use the Radiographone." This primarily describes a photophone configuration, for which "clear actinic light is absolutely necessary". wikipedia.org
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