The first public exhibition of a Foucault pendulum took place in February 1851 in the Meridian of the Paris Observatory. A few weeks later, Foucault made his most famous pendulum when he suspended a brass-coated lead bob with a wire from the dome of the Panthéon, Paris. The period of the pendulum was formula_1 seconds. Because the latitude of its location was formula_2 = 48°52' N, the plane of the pendulum's swing made a full circle in approximately formula_3 = 31.8 hours (31 hours 50 minutes), rotating clockwise approximately 11.3° per hour.