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| title = The Mechanical Properties of Wood ...oken off or fall off. Subsequent growth of wood may completely conceal the stubs which will however remain as knots. No matter how smooth and clear a log is

...Kokusai mechanical filter.jpg|thumb|300px|alt=photograph|'''Figure 1.''' A mechanical filter made by the Kokusai Electric Company intended for selecting the narr ...cer]]s which convert the electrical signal into, and then back from, these mechanical vibrations.

...it usually changes with frequency. The energy involved can be electrical, mechanical, magnetic or thermal. The concept of [[electrical impedance]] is perhaps th ...ling (telecommunication)|signal]] source, a [[radio]] [[transmitter]] or a mechanical sound (e.g., a [[loudspeaker]]) operates into a [[External electric load|lo