Experimental Proofs of the Earth’s Rotation
Rigge, William F., S.J.
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First Paragraph: In establishing the truth of the Copernican system, professors of astronomy are apt to look upon Foucault’s pendulum as the one experimental proof of the earth’s diurnal rotation. They may also possibly refer to the gyroscope, to the deviation of projectiles and of bodies falling from a great height, and to trade winds and ocean currents; but if they do, it is rather by way of confirmation than of genuine proof. As leisure and means are wanting for special research, they may settle down to the conviction that Foucault’s pendulum is the only true experimental proof that has ever been advanced.