Thanks for all the tips everybody, but I think things have gotten off-course.

I have access to a fully-working Kodak projector (probably one of the Medalist AF series, it can take the 140-slide carousels). I was trying to find out the chances that carousels of unknown manufacture and vintage (and which are currently 2000 miles away from me) would work on it. I guess I'll have to find out the manufacture of those before I even have a chance of knowing. It would be a PITA to bring the wrong projector the next time I head out that direction.