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  Christiaan Huygens invented the first pendulum controlled clock.
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  William Clement upgraded the original clock by adding suspension springs to it.
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  Daniel Quare introduced to the public concentric minute hand for watches. He thought about working on making watches repeat the time.
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  George Graham and John Harrison invented more important things for watch clocks. George Graham created the cylinder escapement and John Harrison created the grid-iron compensation pendulum.
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  Josiah Emery improved the design of the lever escapement that was introduced by Thomas Mudge in 1759.
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  An Edinburgh clockmaker named Alexander Bain created the first electric clock.
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  Pierre Le Roy and Thomas Earnshaw introduced to the public temperature compensated balance wheel. They got the idea because of enlightenment era in Europe brought many advances to clock mechanisms