Kodak Pageant and B&H
Kodak Pageants were manually threaded I remember. I always liked the B&H better because of it's "automatic" loading. We had the Supe8 little brother to those machines. The difference was on the 16mm version, you could thread the machine automatically but you still had to roll it onto the takeup reel.
On the Super8mm version, it was done automatically but you had to hold down the tension button so wouldn't flutter.
The Kodak super 8s at the time were better in that you insert the film into the hole and it did the rest.
The best movie projector I've had was a Kodak moviedeck. It was as automatic as it got. It's one of those weird ones where the film sat horizontally on top (like a record player), the film snaked through the machine, and wound up on the takeup underneath. Had an uncle that died and left us his stuff. He had a Moviedeck in his closet with a red reel of film. I tried it and it worked. The film was a porno (go figure). So to make sure the machine worked I viewed the entire film >

. The film wasn't a blockbuster (maybe another kind of 'buster'). Started out with 2 kids smoking pot and then it got bad from there. So I brought it home (the machine, not the movie) and got a chance to investigate it more. I found out you can fix the film to loop around the reel such that it holds on, and when it comes to the end, the projector will sense that and start the rewind process... TRULY AUTOMATIC! Unfortunately, Katrina took both the B&H, the Kodak Moviedeck and all our home movies. At least we have memories.
I found out the movie "The Ugly Little Boy" was an Isaac Asimov story, only dumbed down and cheesed up for 16mm classroom viewing.