I will try make one soon, maybe even an animated drawing showing how a machine could work based on it. First I am performing some experiments to verify what actually happens in nature with the balloon. If I make a machine drawing up and it is all based on assumptions and bad science, it would be just crackpottery.
The experiments I did yesterday used a valve, custom connections, garden hose, and a p.e.t. 2L sparkling water bottle. Not the best setup since garden hoses and p.e.t. bottles are not so rigid. Still it brought back some results. Until I set up the rigid pipes though, I cannot say for certain what happens physically in nature. I will say, that it appears the balloon doesn't change size (significantly). The garden hose appeared to contract slightly and this threw everything off a bit. When I tried it in an open system situation the balloon contracted a massive and noticeable amount. With the closed system situation and a partly rigid container (garden hose and p.e.t. bottle), the balloon contracts a tiny amount and I think it is from the garden hose contracting.
If the balloon is not changing significantly in a partly rigid system (almost good enough) - then the container pressure must be decreased (similar to how water can hold static pressure, maybe in this case it holds negative static pressure below atmosphere), or the balloon temperature must increase in order to maintain equilibrium. Or, somehow the balloon just acts like a steel ball would (not affected by pressure) and I doubt this since the balloon air is still exposed via soft rubber surface. I have not measured temperature or exact pressure changes yet. Need more materials and time.
I would like to know why nature would choose one or the other and whether we can predict which one it usually or most definitely chooses. By one or the other, I mean either temperature of the balloon must increase to maintain constant volume and increase pressure, or the pressure of the container must drop. Is temperature increase in the balloon a no-no? Nature just wouldn't do that? Why? What law? What causes nature to choose one or the other and why do we know it is one and not the other? Some common behavior we know of?
One interesting tid bit to think about is - where would a "loss of container pressure" go to and come from? Was it transferred from the static pressure of water in the container (static pressure is 0, or atmosphere). And if so, where did this pressure disappear to? Would it be converted into molecular movements holding everything together in the container, a glue like strength? As the pressure of the container drops, the water molecules steal some "pressure" and convert it to intra molecular glue/quantum movements? If the pressure is stolen, it is no longer pressure, so pressure was converted again into WHAT exactly? Molecular stretching/binging/ramming/glue?