A clock is a device which is used to measure and show time. A series of gears control the three hands of the clock. These hands move at different speeds, depending on how far the gear's teeth are from the central axle. Most clocks have an hour hand, a minute hand, and a second hand. The second hand's gear is the smallest and is constantly moving. The minute hand is of medium size, and its gear has a circumferencethe measurement of the distance around the outside of a circular shape is 60 times as large as the second hand's gear. The hour hand moves even more slowly; it rotates to the next hour number as the minute hand makes one full rotation around the clock. *Louisiana Tech University, 2016

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