I don't understand some components of the used slide projector I bought.

Kodak Carousel 850 projector m58 15 timer. There are three loose(?) lenses in a compartment on the side. I downliaded a pdf of a very similar model, but the lenses weren't addressed. Any help would be appriciated. I can provide pics if needed. via /r/photography http://ift.tt/2jf8ypz