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Seeding energy for initial rotation may come from manual stimulation. This is achieved by use of a rattling mechanism (23,24) or, conversely, by any externally applied electromagnetic alternating field from a separate power supply. Such is the sensitivity of a taut music string that, in air, human vocal drone power will also serve this purpose. Providing a suitable resonance is adjusted for and set, the rotor will be induced to spin and in the absence of any further stimulation, said rotation and vibration will decay over a period of several seconds. |
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