since a lot of people answered the question i can give some info on the back in the day part as i used to be a theater projectionist about 20 years ago. at my theaters we would get a shipment from UPS or Fed Ex usually on Wednesday and Thursday with new movies coming out. they would come in a box like this
https://a.1stdibscdn.com/archivesE/upload/1121189/f_299373321660659829607/29937332_datamatics.jpg
with 3 or 4 reels of a movie, which was about 20-25 minutes. at my theater we spliced (taped) the two ends together and then they sat on a giant platter. sometimes they would also come with specific movie trailers that you would have to splice on to it as well . we were also given discretion to add whatever we wanted, at least we were until someone added shaft to the pokemon movie as a joke.
our projectors and platters looked like this one
https://www.elivermore.com/photos/Sites/lvr_cinema004.jpg
the movie would be one one platter, get threaded through the projector, and then back onto another platter. also not pictured, we would have dryer sheets taped or pinned to various places. static electricity was a mother fucker with these styles of projectors.
after the movie was done in the theater we would have to cut the tape that spliced the reels together and ship it back to where ever.
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