...that wasn't scientific...
and before i completely trust Rowbotham's scientific experiments, i would like to remind you that he was conducting them with a specific goal in mind as to what results he wanted to find. i remind you of the "bedford level experiment" in which he thought he had proved a flat earth, only to have the experiment redone, proving a round earth, and seeing co-flat-earther john hampden imprisoned for libel.
of the hundreds of foucault's pendula in the world, many at universities, rowbotham is the first i have heard of, well over 100 years ago, to ever suggest its findings were flawed.