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Here is a link to a 10-minute Max Fleisher cartoon, showing how the variable density optical sound system, invented by Western Electric, worked:
http://video.google.com/videoplay?docid=5343183668790857343&q=genre

Finding His Voice
Western Electric Company, Inc.
10 min 39 sec - 1929

Actually, a very instructive film that was shown to early audiences when "talkies" were introduced.

Enjoy!

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John P. Pytlak, Senior Technical Specialist
Customer Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: +1 585-477-5325 Cell: +1 585-781-4036 Fax: +1 585-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion

There's also an excellent half hour television episode of the 1960's program, "The Twentieth Century" entitled, "The Movies Learn To Talk". It's hosted by Walter Cronkite.