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Wafeek,Anthony,Augustine

INTRODUCTION

A quartz clock is a clock that uses an electronic oscillator that is regulated by a quartz crystal to keep time. This crystal oscillator creates a signal with very precise frequency, so that quartz clocks are at least an order of magnitude more accurate than mechanical clocks. The first quartz clock was built in 1927 by Warren Marrison and J.W. Horton at Bell Telephone Laboratories.

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A cantilever made of quartz (E = 10¹¹ N·m^−2^ = 100 GPa and ρ = 2634 kg·m^−3 with a length of 3 mm and a thickness of 0.3 mm has thus a fundamental frequency of around 33 kHz. The crystal is tuned to exactly 2¹⁵ = 32,768 Hz or runs at a slightly higher frequency with inhibition compensation (see below) .

REFERENCES

1. Wikipedia  +:http://en.wikipedia.org/wiki/Quartz_clock+
2. http://www.capetowncorp.com/whatsnew/quartz.html

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