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The string in Meldes experiment can be made to vibrate in several ways. In most schoolphysics experiments the devices are:

1) loudspeakertype vibrator, where a rod is connected to a loudspeakermembrane and transmits the oscillations to a wire mounted on the end of the rod.

2) small DC-motor with an arm attached to the rotor. The string is attached to the arm, which moves up and down

3) electrical vibrator with coils and vibrating metalblade. The string is attached to the metalblade.

In each case the device is driven by a signal-generator that outputs a harmonic electric signal.

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