>>9431155>>9431159and so it happens there was an experiment conducted by a german engineer. i'll post it here
In Riedern A.S. in Klettgau on May 24 2001 between 11 and 12am, the engineer Wilhelm Martin (deceased since 2009) conducted on experiment (which was witnessed by Rolf Keppler) with a theodolite (leveling device) called a dumpy level.