In reply to  ROGER ANDERTON's message of Fri, 2 Jul 2021 20:44:44 +0100 (BST):
Hi,
[snip]
>
>Hi
>
>Does anyone here have access to a vacuum drop tower; I want to do an 
>antigravity experiment

If the effect is so small that you need to do it in vacuum, then it's not worth 
the effort anyway.
Regards,

Robin van Spaandonk <[email protected]>

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