the largest Foucault's Pendulum ever constructed is located in the Pantheon in Paris, France. Here are the dimensions of this particular pendulum:
Length of Pendulum: The length of the wire or cable supporting the pendulum is approximately 67 meters (220 feet).
Weight of Bob: The pendulum bob, which is the massive weight at the end of the pendulum, weighs around 28 kilograms (62 pounds).
Swing Time: The time it takes for the pendulum to complete one full swing, known as the period, is approximately 17 seconds.
It's worth noting that the Pantheon's Foucault's Pendulum is an impressive example, but there may be other large-scale pendulums constructed since then that I'm not aware of. It's always possible for new records to be set in terms of size or other parameters related to Foucault's Pendulums.