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The Greek philosophers Anaxagoras and Empedocles both referred to water clocks that were used to enforce time limits or measure the passing of time. [35] [36] The Athenian philosopher Plato is supposed to have invented an alarm clock that used lead balls cascading noisily onto a copper platter to wake his students. [37]
Time clocks.—Such an appliance which may not, in general, be used in the field, but which is of immense value in the office and particularly in a shop, is the time clock. Various forms of time clocks are in common use, two types of which are illustrated.
Shadow clocks were modified sundials that allowed for greater precision in determining the time of day, and were first used around 1500 BCE. [1] Their major innovation was a modified, more precise gnomon that allowed for the division of night time into 50 parts, with an additional two "twilight hours" in the morning and evening. The shadow ...
c. 3500 BC - Egyptian obelisks are among the earliest shadow clocks. [1] c. 1500 BC - The oldest of all known sundials, dating back to the 19th Dynasty. [2] c. 500 BC - A shadow clock is developed similar in shape to a bent T-square. [3] 3rd century BC - Berossos invents the hemispherical sundial. [4] 270 BCE - Ctesibius builds a water clock.
The Romans used various ancient timekeeping devices. According to Pliny, Sundials, or shadow clocks, were first introduced to Rome when a Greek sundial captured from the Samnites was set up publicly around 293-290 BC., [2] with another early known example being imported from Sicily in 263 BC. [8]
Chess clocks are used to limit the board game players' time to make a move. In various sports, game clocks measure the duration the game or subdivisions of the game, [95] [96] while other clocks may be used for tracking different durations; these include play clocks, shot clocks, and pitch clocks.
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