Rubens tube physics apparatus.
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Previously:
https://www.homemadetools.net/forum/...947#post206952
https://www.homemadetools.net/forum/...814#post202245
https://www.homemadetools.net/forum/...458#post200680
https://www.homemadetools.net/forum/...538#post193166
https://www.homemadetools.net/forum/...984#post207117
