Introduction electromechanical devices that provide amplification in the gigacycle-per-second range-electron beam devices which, like other physical electronic devices, depend on the small mass of the electron for high-frequency operation. In current research concerned with controlled thermonuclear fusion the plasma can be regarded for some purposes as a highly conducting gas elevated to such a high temperature that it cannot be contained by solid boundaries. Thus proposed thermonuclear devices attempt to contain the plasma in a magnetic bottle. This illustrates another important application of electro-mechanical dynamics--the orientation, levitation, or confinement of mechan-ical media. More conventional examples in this category are those that use magnetic or electric fields to levitate the rotor of a gyroscope, to suspend the moving member of an accelerometer, or to position a model in a wind tunnel.
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