In Search of the Missing Fundamental: by Richard K. Jones
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Membrane Modes

The (3,1) Mode
The fifth mode of a circular membrane is the (3,1) mode which has three nodal diameters and one nodal circle (the outside edge). Like the (1,1) and (2,1) modes, this pattern is a poor radiator of sound and therefore takes longer to decay, and contributes to the harmonicity of the pitch of a timpano. It is the third of the preferred modes.

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