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 ...

Would you believe a pendulum clock that can keep time accurately to within one second per year? If you answered “yes”, you’ve either never tried to regulate a pendulum clock yourself ...

A watch differs from a clock In its having a vibrating wheel instead of a vibrating pendulum ; and, as in a clock, gravity is always pulling the pendulum down to the bottom of its arc, which is ...