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The 60 based time system created by the Sumerians is why we have 60 seconds in a minute, and 60 minutes in an hour.
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it was found in The Valley Of The Kings, Egypt, on the floor of a workman's hut. it is estimated to be the oldest sundial made by humans.
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the first water clock was made by I-Hsing, called,"Water Driven Spherical Birds-Eye-View Map of The Heavens", but it had some major defects. Chang Ssu Hsiin added some changes, and this new clock worked much more effectively.
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before these public clocks on towers and in city squares, no record of other physical mechanical clocks was found. by this time, engineers and astronomers had written down and figured out how to make a working mechanical clock, but had never actually created one because it was so hard to make.
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it was invented in New Hampshire, by American Levi Hutchins of Concord. this alarm clock could only ring at four o' clock. it couldn't be adjusted, and it was the kind of clock that had a bell and rung.
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they were invented at the beginning of World War I, for soldiers to look at the time. before watches, pocket watches were common. it is said that Napoleon thought that it was too much work taking out his pocket watch every time he wanted to know the time.
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first introduced at the St. Louis World Fair by the Ansonia Clock Company, the Plato Clock was one of the main influences for the modern digital clock. it was a cylinder, with a glass case. instead of a minute and hour hand, it had pieces of paper with single digit numbers that flipped and showed the time.
