Identifying mechanical linkage models for school display

[AronSora]

Hey guy,

I'm working at my school to ID our collection of kinematic models and make signs for explaining them. I have them almost done, but there are a few I can't find in any of the books, can you guys take a look at the attached and linked pictures and see if you can ID them?

 

[Mech_Engineer]

1. Not sure, might be able to tell more with a picture of the other side. It involves a lot of mechanical advantage whatever it is.
2. Hard to say, could be some sort of idler or differential? Where's the other half?
3. Looks like a steam piston to me, could have been used for any number of things.
4. Same as above.
5. I want to say steam piston as well, but the second smaller piston makes me think it's a 2-stage compressor...

 

[Mech_Engineer]

For the attached thinmbnails:

1. Looks like a reversing rack and pinion system. As the pinion spins around it moves the bar to one side, and then back. Kind of an interesting design.
2. I guess this is the other side of the piece I was asking for another picture of. Looking at it, I'm not sure what it is... seems like it might be for cutting a helical groove in a circular plate?
3. Seems like some kind of large industrial right-angle transmission. What its for is anyone's guess...