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The first mechanical clock was invented in the early 1300's. With this invention time began to be measured in hours (24 hours equaling a day).
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Galileo, an Italian scientist, discovered the pendulum in 1581. The pendulum greatly improved the constant movement of the hands or bell of a clock. The average error with the pendulum varied only by seconds each day. Before this the error was from 10 to 15 minutes a day.
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During the 1600's the metallic gear, or toothed wheel, and the use of the screw in assembling the clocks were first used.
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digital clocks have radios and ipod jacks bult in and they also have different brightnesses