User:Jonathan W/Myst walkthrough/A/7/f
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A7
Final answer: You need to get into the cabin, open the safe and light the boiler first. Now, start turning the steering wheel beside the boiler. It might take a while, but when the boiler is hot enough, the pressure will build up (as you can see in the meter above the boiler) and the tree will start rising up out of the ground. The more the boiler is running, the faster the tree will move. Likewise, if you cool down the boiler by turning the wheel the other way, the tree will sink back into the ground.
Now, you need to use this machine so you can get underground. It's fairly simple, once you get the idea. First, build up the pressure so the tree will rise out of the ground. Part of the tree is hollowed out, so you will be able to get inside and ride in the tree like an elevator. When the hollowed bit rises out of the ground with the tree, just let it go up high a ways first. Then go back into the cabin and turn the wheel the other way, so the tree will sink back into the ground. If you're quick, you can run outside the cabin and climb inside the elevator when it reaches the ground. Once you're in the elevator, wait for the tree to finish sinking. Soon the elevator will take you to a small underground cavern. In the cavern is a book that will take you to Channelwood. Happy exploring!