Sound film "The Clue of the New Pin", a British Lion production using the sound-on-disc British Photophone system. In May, "Black Waters", a British and Dominions Film Corporation promoted as the first UK all-talker, received its initial trade screening; it had been shot completely in Hollywood with a Western Electric sound-on-film system. None of these pictures made much impact. The first successful European dramatic talkie was the all-British "Blackmail". Directed by twenty-nine-year-old Alfred Hitchcock, the movie had its London debut June 21, 1929. Originally shot as a silent, "Blackmail" was restaged to include dialogue sequences, along with a score and sound effects,
Alfred Hitchcock as he reads a book on the London Underground. In the PBS series "The Men Who Made The Movies", Hitchcock explained how he used early sound recording as a special element of the film, stressing the word "knife" in a conversation with the woman suspected of murder. During this period, Hitchcock directed segments for a BIP revue, "Elstree Calling" (1930), and directed a short film, "An Elastic Affair" (1930), featuring two "Film Weekly" scholarship winners. "An Elastic Affair" is one of the lost films. In 1933 Hitchcock was once again working for Michael Balcon at Gaumont British. His first film