Photographophone References Sources Eyman, Scott (1997). The Speed of Sound: Hollywood and the Talkie Revolution 1926–1930. New York: Simon & Schuster (chapter 1 available online). External links Eugene Lauste PBS History Detectives episode on Lauste Stephen Herbert, Who's Who of Victorian Cinema:Eugène Augustin Lauste 1857 births 1935 deaths 19th-century French inventors French emigrants to the United States