Magdeburg hemispheres experiment.
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Previously:
https://www.homemadetools.net/forum/...444#post231337
https://www.homemadetools.net/forum/...403#post231230
https://www.homemadetools.net/forum/...651#post209501
https://www.homemadetools.net/forum/...512#post200984
https://www.homemadetools.net/forum/...271#post230823
