What is the swing of the Foucault pendulum, has to do with the rotation of the earth?
Foucault demonstrated the earth’s rotation via his famous pendulum. He suspended a 28-kilogram (62 lb) brass-coated lead bob with a 67-meter long (220 ft) wire from the dome of the Pantheon, Paris – Wikipedia
Here is the animation of Foucault's Pendulum.
https://upload.wikimedia.org/wikipedia/commons/8/82/Foucault-rotz.gif
Let mark a point “A” on the outer diameter (big enough) of the wire of Foucault's Pendulum, facing exactly west or any other specified direction.
The wire of Foucault's Pendulum doesn’t spin during swinging in the experiment. It can be observed easily in the above animation – Right. It is the earth, which spins, not the wire of the pendulum. After 24 hours or more
Point “A” is also seen by the north, east, and south of the earth if the green trace in the above animation shows the path of the pendulum bob over the ground (a rotating reference frame).
I may be wrong but I suspect the force that sat the swing of the Foucault pendulum might not be in the perfect direction. The density of bob also affects the direction of the applied force.
Because
If the aforementioned experiment really shows the evidence of rotation of earth then we can also get the same result from the following experiment as well.
– Simply, here we don’t need the swing of the pendulum.
Let both the wire and the bob of the aforementioned experiment are at rest and don't rotate. Attached a laser light torch to the bob of the aforesaid pendulum such that it shines a laser light exactly toward the west (in a straight line) perpendicular to the above said 67-meter wire. OR it can be any mark on the wire or bob facing in a specified direction.
Remember: The wire used in the experiment of Foucault's Pendulum doesn't spin during swinging.
After 24 hours or more
The laser light, in this case, is not seen by the north, east, and south of the earth - I believe.
What do you think?
Your comments, please!!!