Pendulum clocks, This is How they work
The 16th century scientist Galileo first realized that pendulums could keep accurate time, although the invention of the first pendulum clock is credited to the Dutch scientist Huygens, in 1656. All these clocks contain the same components and work in much the same way.
One problem is that the length of a pendulum’s swing will vary as the temperature changes - during the 18th century, the grid pendulum was devised, which used the theory of differential expansion of steel and brass to ensure that the pendulum’s swing distance did not change. More progress was made during the late 19th century as it was realized that a pendulum operating in a vacuum would be even more accurate. For a simple device, the pendulum has been surprisingly useful over the years. Not only did it revolutionize the way we measure time; it has also been used to detect earth tremors and to demonstrate the rotation of the earth.
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