Coupled mechanical and helicon oscillations

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Abstract
The rotating sphere method of studying magnetoconductivity, when applied to pure aluminium is greatly disturbed by slow and persistent mechanical oscillations whose frequency at low fields (<1/2T) follows the helicon frequency and varies as B, but at higher fields increases more slowly to a maximum and ultimately falls again. This variation, including a fall as B-1 at high fields, is explained by assuming the sphere not to be rigidly fixed but elastically held, and, through flexure of the supporting rod, capable of rotation about a horizontal as well as a vertical axis. Damping by a dashpot is not wholly effective until the supporting rod is made rigid enough to eliminate rotation about a horizontal axis.

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