Abstract
The paper records an investigation of the vibration of a symmetric tuning-fork, with particular reference to the effects of the fork mounting. The relation between flexural vibration of the tines and longitudinal vibration of the fork as a whole is analysed in terms of the coupling induced by unbalanced inertia forces directed parallel to the axis of the stem. It is shown theoretically and confirmed experimentally that longitudinal oscillations can occur at fork frequency and twice fork frequency, and that the fundamental frequency of the fork is affected by the mounting characteristics if there is primary longitudinal unbalance. A method is described whereby the primary component of longitudinal unbalance may be eliminated.
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