That big grandfather clock in the library might be an impressive piece of mechanical ingenuity, and an even better example of fine cabinetry, but we’d expect that the accuracy of a pendulum ...

and the spring has to begin its work again. The balance wheel at each vibration allows one tooth of the adjoining wheel to pass, as the pendulum docs in a clock ; and the record of the beats is ...

You might recall the classical experiment in Freshman physics of two pendulums that are coupled together wtih a soft spring. This pendulum system is another example of a system that exhibits beating ...