https://savageplane.wordpress.com/2016/11/20/was-foucaults-pendulum-a-fraud/
This is a good summary of Foucalt’s Pendulum and what was believed at the time of the experiment from both supporters and skeptics. A fan of Foucault’s work was quite disturbed with the anomalies and inconsistencies of the pendulum’s performance. He went to talk with Professor Humboldt to get his input:
“After seeing the pendulum-experiment here also and, strangely, again with a deviation to the left, I went to Alexander v. Humboldt, who was indeed ever the first refuge of those seeking information. He received me very friendly and spoke the memorable words: I have known, too, for a long time, that as yet we have no proof for the Copernican system, but I shall never dare to be the first to attack it. Don’t rush into the wasps’ nest. You will but bring upon yourself the scorn of the thoughtless multitude.”
“This is a good summary of Foucalt’s Pendulum and what was believed at the time of the experiment from both supporters and skeptics.”
Umm, no, that’s a flat earther website offering only sources to support that position, and some quite deceptively. For example, pretending that having to use a motor or magnet to counteract air resistance has something to do with the actual phenomenon that the pendulum demonstrates, when in reality it is just a necessity since we cannot construct perpetual motion machines.