Following is an excerpt form a WT. I think it is pretty explicit.
Go back into the structure to the center where there is a short cross walkway with an elaborate circular apparatus on each end. These are identical, and the only way to distinguish between them is that one has steam escaping next to it from below. Get closer and examine this unit, then go to the one opposite. Another optical effect occurs in which Dr. Bremmer appears with a message: "...one gas can be used...two times stronger than the other gasses in the collector that gets it from the atmosphere. The collector is unstable so you can't know which pipe carries the correct gas...measure lifting power. Just one try because the pattern changes each time. I wish I could..."
The circular devices opposite each other are the gas collectors cited by Dr. Bremmer, and from the message fragments you may gather that you need to select a particular gas that is twice as buoyant as the other that is available, and you must do this in just one attempt. Save your game here so that you can investigate these collectors to see how they operate, after which you can then start anew for your one attempt to find the buoyant gas in each.
When you get close to a generator you will see 10 handles that release gasses when depressed, all but one of the same buoyancy. In the center of the device is a bidirectional valve with an arrow that indicates the direction of gas flow, and can be observed turning to point to the right as you initially approach the collector. Though you have no way of knowing it, the larger pipe to the left of this valve leads to the fish balloon; to the right the gas goes through a smaller coiled pipe to a small balloon next to a round gauge that measures buoyancy by the lift movement of the balloon. The gauge has two indicators, a black outer one at 12 units per division, and an inner vernier at 1 unit per division.
Try it out: press one of the collector handles, then press the center valve. The gas goes to the right to the rising balloon, which moves the center gauge indicator 1 division. Turn back to the collector, where the center valve now points to the left. The only way to turn it back to the right is to push on one of the handles, sending gas to the fish balloon; there is a brief video of this balloon from a distance, in which the fish inflates somewhat, then deflates again (assuming that you have not by chance used the handle controlling the more buoyant gas). Try this sequence some more, counting the times that you press a handle, then press the center valve to get a buoyancy reading. If you press more than 12 times the outer gauge indicator will move as well as the inner one.
Now you are ready to determine which of the handles controls the extra buoyant gas. Since you've messed with the collector and Dr. Bremmer said in effect that you could not do that, restore your game. Select a reference handle, any one will do as long as you note which one. Press that one once, then move to the next handle (either way) and press that one twice, the next one three times, and so on one by one around to the tenth, pressing that one ten times. Press the center valve sending the collected gas to the small balloon by the meter. If all the gasses had the same buoyancy the meter would read 55, the number of times that you pressed handles, but since one gas has a buoyancy twice that of the others, the value will be higher than that. Subtract 55 from the reading you get, and you will know which handle controls the extra buoyant gas. (Work it out.)
Turn back to the collector, where the center valve now points to the left. Press the handle that you have determined controls the extra buoyant gas, and if you have made the correct determination you will see the fish balloon inflate and rise half way. Now go to the other collector and repeat the process in order to bring the fish balloon the rest of the way up to the platform, where you will see it become attached. The mouth opens so that you can enter the balloon. Go to the end platform and do that.
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