Abstract
A mechanical theory is developed for composite torsion pendulums emphasising the interaction between components. The interaction is eliminated to obtain the intrinsic internal friction in solids. A definition of internal friction is given in a general form as a function of frequency and the moment of inertia. Two equivalent formulations of internal friction, which are related to each other through a simple relation, are obtained by the use of the definition. A torsion pendulum in forced oscillation is considered to clarify the significance of the formulation.
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