I have been trying to gather a list of counterweight devices that are designed to do some kind of physical work. I was wondering if anybody could clarify or add to my list? List: 1. pulley ( simple or compound) 2. lever 3. hydraulic cylinder (with equal dimension cylinder and equal mass on each side 4. Weighted wheel? I was wondering if something like a large Ferris wheel with an equal distribution of large weights (say 1 ton) were installed all around -- is this a counterweight of a sort? The only power needed to turn the wheel is the power needed to overcome the friction? I don't know what kind of work this wheel could do but my query is how hard it would be to turn even though there are heavy weights distributed evenly.