>>For the nonprojectionists in the audience, what the heck is
>>brain wrap?
>
>Well,
>I could give you a three page explanation of how a modern movie
>projector works, and how it can break.
>OR
>I can tell you : it's bad.

Or I could supply a Kodak web page that has a quick definition on it:

http://www.kodak.com/US/en/motion/newsletters/reel/may97/fail-safe.shtml

This also has Kodak saying how polyester stock with damage the gear in the brain, which might have been what I misunderstood from our engineer. Or he was simplifying for us college students. :)

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Chad Collier--"Not only does it interrupt the show, but it also can be a substantial hassle to an operator whose nerves are strung tight by long summer hours." Boy howdy, is that ever true...
Digital Bitch
J. Random VFX Company