Inspired by Galileo Galilei, in 1656 Christiaan Huygens invents pendulum clock. Through 18th and 19th centuries until 1930s, these clocks are precise time keepers. They use weights with escapement ...
THE most accurate timekeepers of to - day are divided into two classes, depending on whether the restoring force of the oscillator is gravity, as in pendulum clocks, or elasticity, as in quartz ...
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