In the afternoon in Manhattan a man sits at a microphone watching a clock. As minute and second hand cut the hour he speaks. The vibration which is the "sound" of his voice becomes an electrical vibration. It speeds along a wire to a building in a scrub-pine clearing 40 miles away. There with the aid of a wafer of quartz crystal vibrating at a constant frequency of perhaps 11,830,000 cycles per second, and boosted by thousands of watts of electric power, the vibrations ripple from a great antenna outward in waves...
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