Word: magnetism
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Anytime you move a magnet in the close proximity of a coiled wire (or vice versa) you cause a current to flow through the coil. In the stereo cartridge we can either attach a magnet to the stylus arm and hold two coils stationary in the body of the device, or we can wind two coils onto the arm in different directions and mount a stationary magnet in the body. Either way (one is called "moving magnet", the other "moving coil" for obcious reasons), when the needle does its mazurka in the groove the stylus arms follows, and the groove...
...free to trace grooves as fine as 2,000 vibrations per inch (our math upon request); must be perfectly free from resonances in the range of frequencies possible in the plastic; must be mounted in such a way that it remains perfectly centered at the resting point, with relation magnet to coils...
...maser in use on the radio telescope at the University's Harvard, Mass., Observatory is contained in a box about four feet long and one foot wide and deep. The crystal that is the heart of the maser is a synthetic ruby placed between the two poles of a magnet and kept in a both of liquid helium at a temperature about two degrees above absolute zero(--491* Fahrenheit...
...special magnet ($150) that can be worn inside trousers, also for use in partnership operations. While one gambler tosses dice in which metal dust has been worked into the paint spots, his partner stands at the other end of the table, controlling the spots by imperceptible body movements...
Viet Nam (land of the south) has long been a magnet for conquerors. First came the Chinese, who drove south in the 2nd century B.C. to grab control for a thousand years, labeling the area Annam (pacified south), exacting tributes of pearls, precious stones, elephant tusks and valuable woods for the Emperor. Cleverly, the Annamese took the best China had to offer?the Chinese classics, the ethics of Confucius, and Mahayana Buddhism. But they fought fiercely and persistently to regain their independence...