DeVry had a hand-cranked projector which Edmund sold surplus for $20
so in the seventies and eighties.  They had a pull-down claw and would
go in both directions, with a fairly dim lamp.

I have a Speco motion analysis projector that can run on a motor or be
hand-cranked... in single-frame or hand-crank mode there is a heat absorbing
glass which drops down.

And it wouldn't be hard to turn an old B&H 500-series projector into a 
hand-cranked thing... the hard part would be putting a much lower intensity
lamp into it, and rigging up a fan to keep the lamp cool.
--scott
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