How a Graphophone records and plays sound
The vertical “hill-and-dale” groove, as played by a Columbia Graphophone, c. 1902. Patented by Charles Sumner Tainter, Chichester A. Bell, and Alexander Graham Bell in 1886, this vertically undulating groove, cut into a wax surface, was the most successful method employed in cylinder sound recording.
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Contunico © ZDF Studios GmbH, Mainz; Thumbnail Gary Todd; © Georgios Kollidas/Dreamstime.comOverview of the invention of the telephone, with a focus on the work by Alexander Graham Bell.
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NASA/Dryden Research Aircraft Movie CollectionAn X-15 rocket-powered research aircraft launching from a U.S. Air Force B-52, c. 1960s.
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© American Chemical Society (A Britannica Publishing Partner)Learn about the development and applications of glass paint, which is made of silica glass and formulated to reflect sunlight, protecting surfaces from heat and damage.
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Encyclopædia Britannica, Inc.This software lets you slack on “do,” “re,” “me.”
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Contunico © ZDF Studios GmbH, Mainz; Thumbnail Gary Todd; © Georgios Kollidas/Dreamstime.comOverview of the invention of the telephone, with focus on the work of Alexander Graham Bell.
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© Open University (A Britannica Publishing Partner)A discussion of how the AT&T Corporation coped with the massive increase in telecommunication traffic that immediately followed the attacks of September 11, 2001.
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© American Chemical Society (A Britannica Publishing Partner)How Thomas Edison changed the world.
