My 25-year-old cuckoo clock hung on the dining room wall silent for over two years. Finally, this month, I decided to see if I could repair the clock to produce the comforting, hourly cuckoo whistle ...

Using this design, you can construct an electromagnetically impulsed pendulum clock with a 1-second beat. On the prototype, the pendulum rod is 115cm long with a bob adjusted to make it beat every ...