unfortunately, you are correct. the string would prevent it from going forever. also, even though it is in a vacuum, it is probably not that high of pressure even without the string.
here are the materials needed
Found this: https://www.quora.com/Has-the-Cavendish-experiment-ever-been-done-in-a-vacuum
What's up with this: "Torsion balance mounted inside of vacuum chamber an a vibration damping table (not shown)"
Not shown lol...where is it??
I thought this was as easy as me jumping off a building. Haha
they look like scales or like this https://www.planolith.de/site/assets/files/1039/untergestell-mit-schwingungsisolierung-1.png
i would first try the experiment with just plexiglass on all 5 (or 6) sides and add more levels of difficulty if i didnt see consistent results as expected.
So you would just keep adjusting the experiment until you got the result you wanted? I imagine a lot of these people that performed these experiments did the same thing. They stopped once they saw what they thought should happen.
I think we need to start with a vacuum. It seems to be the correct way to perform this experiment, with no draft possible.
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