Eastman Kodak Super 8, 1965
Regular 8, or double 8, introduced in 1932, lasted nearly thirty years before serious consideration was given to improving it. The principal impetus for change came from those people who wanted to see the gauge become a bigger factor in the commercial, industrial and educational markets. For these markets, sound-on-film was a must, and the regular 8 format did not have enough room for an adequate sound stripe. Furthermore, many felt that the nuisance of having to stop after 25 feet, open the camera, and re-thread the film discouraged a lot of people from active use of the format.
So after several years of work and experimentation, in June 1965, Eastman
Kodak unveiled a brand new film format, faster film, a nifty new cartridge, and new cameras and projectors. First, the film perforations were much smaller, giving a nearly 50% bigger image area, and leaving room for a sound stripe and balance stripe, if desired. On top of that, the film cartridge slipped nicely into the camera, and told the camera exposure system what kind of film was inside!
http://www.oldfilm.org/nhfWeb/ed/essays/Kattelle_Film_Gauges.htmShe has been babbling that Super 8 cameras with sound weren't available in 1968. I don't want to take the time to create an account, since it doesn't look like a forum I would want to revisit. It's probably a waste of time, since it looks like she changes the topic frequently when she gets cornered.