Abstract
THE well-known Larmor analogy between the deflecting force exerted by a magnetic field upon the motion of electrically charged bodies and the Coriolis force which similarly deflects a moving body relative to a rotating system of reference, suggested to me that the resistance to motion due to electrical eddy currents experienced by a conducting body rotating in a magnetic field should be paralleled when a rotating body of fluid is given a second rotation, for example, about a second non-parallel axis. The experiment, which was demonstrated at the recent meeting of the Australasian and New Zealand Association for the Advancement of Science in Auckland, N.Z., does, in fact, rather strikingly exemplify the gyro-magnetic analogy. A spherical vessel of metal or glass, filled with water and provided with an axle that turns in horizontal bearings and rotated (long enough for the water to take up the rotation) comes very rapidly to rest if set up on a rotating table—or even if the frame in which the hearings are set is turned while held in the hand.
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GRANT, K. Eddy-Current Resistance in Fluids due to Rotation. Nature 139, 673 (1937). https://doi.org/10.1038/139673a0
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DOI: https://doi.org/10.1038/139673a0
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