![]() A second temporary installation was made for the 50th anniversary in 1902. The original bob used in 1851 at the Panthéon was moved in 1855 to the Conservatoire des Arts et Métiers in Paris. The proper period of the pendulum was approximately 2 π l g ≈ 16.5 ≈ 31.8 hours (31 hours 50 minutes), rotating clockwise approximately 11.3° per hour. A few weeks later, Foucault made his most famous pendulum when he suspended a 28-kilogram (62 lb) brass-coated lead bob with a 67-metre long (220 ft) wire from the dome of the Panthéon, Paris. ![]() The first public exhibition of a Foucault pendulum took place in February 1851 in the Meridian of the Paris Observatory. Foucault's pendulum in the Panthéon, Paris
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