The classic design of a mechanical clock generally consists of a display, a way to store energy, a way to release that energy at regular intervals, and a mechanism to transmit it where it needs to ...

As a rule, Donald Saff doesn’t collect clocks he can’t see inside of. It’s the harmonic entanglement of gears—and the skill needed to craft them—that first lured him to horology, the study of ...

Mystery clocks have been popular since the 18th century. The clock seems to have no mechanism but keeps time. One of the most famous is the swinging-arm clock. A tall classical figure, usually bronze, ...

Clocks have been made in forms that depend on the size and shape of the clock's mechanism. The 18th-century tall case, or grandfather, clock was made to hold a long pendulum. In 1816, Eli Terry ...

In the 17th century, Christiaan Huygens, inventor of the pendulum clock, noticed a curious phenomenon. When two identical pendulum clocks are mounted next to each other on a wall, their swings ...

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, or you already ...