The Lemelson Center Invention Feature - Quartz Watch
http://invention.smithsonian.org/centerpieces/quartz/
The wristwatch was completely reinvented with all-new electronic components scarcely fifty years ago. Explore this website to discover what's inside your watch and the people who made the wristwatch revolution possible.
The Pendulum Lab
http://www.elmer.unibas.ch/pendulum/index.html
A virtual laboratory where you can do hands-on experiments at rigid pendula. Together with the material presented in the lecture room, you can learn basic issues like harmonic oscillator and resonance but also advanced topics like parametric resonance, nonlinear dynamics, and chaos.
Timexpo - The Timex Museum
http://www.timexpo.com/index.html
Timex's long history is studded with more innovative, best-selling timepieces than any other watch company in the world.
National Institute of Standards and Technology (NIST)
Time and Frequency Division
http://www.nist.gov/pml/div688/
Maintains the standard for frequency and time interval for the United States, provides official time to the United States, and carries out a broad program of research and service activities in time and frequency metrology.
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