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Vibration caused by eddies of air
which are produced by a stream of air blown across the edge of a plate.
The eddies curl first one way, then the other. It is these changes in
air direction that are the sound source.
Metal inlays in the fingerboard
of some stringed instruments. These are placed perpendicularly to the
strings at premeasured places along the length of the fingerboard to fix
the length of the string when the finger presses behind them.