Quartz crystal accuracy (1975)
TI's quartz crystal time base vibrates naturally at a frequency of 32,768 times every second about 90 times faster then most electronic tuning forks, and thousands of times faster than the typical balance wheel. Tuned to +/- 2 parts per milion by an adjustable 
capacitor, these 32,768 Hz vibrations are divided in half 15 times successivrly to produce one extremely precise referenze pulse each second a reference pulse that assures timekeeping accuracy.
capacitor, these 32,768 Hz vibrations are divided in half 15 times successivrly to produce one extremely precise referenze pulse each second a reference pulse that assures timekeeping accuracy.
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