CHAPTER 47
DIGITAL CLOCKS
Knowing the exact time has become more important today. We have to catch trains that leave at odd times. Radio and television programs start at precise times. Many of the jobs people do involve the precise timing of manufacturing processes, cooking, driving, and so on. Clocks and watches, which not long ago were luxuries, are essential to our lives. Fortunately a new family of clocks and watches has been developed. These rely not on pendulums or springs for their accuracy but on an electric current. A current passing through a quartz crystal produces regular waves which can be made to show time either in figures, as in a digital watch, or on the usual clock face. Quartz crystal clocks and watches are accurate to within ...
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