quartz crystal

quartz crystal

A thin slab of quartz, used to control the frequency of an electronic oscillator. A quartz crystal vibrates at its natural resonant frequency when it is excited with a pulse of electrical energy. As the crystal vibrates, it produces an alternating current whose frequency is determined by the physical dimensions of the crystal.

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Industry/Domain: Aviation
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Industry/Domain: Law enforcement Category: Crime & punishment

The Rack

Another device used to get confession from the convict, usually use to extract name of the conspirator. It was said to be the most painful torture. ...