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Time Keeping devices

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by bob bob on 17 September 2012

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Transcript of Time Keeping devices

Sundials 2000 BC Divided days into 12 hour periods, sun dials track the movement of the sun to tell time. Time Keeping Devices A water clock is any timepiece in which time is measured by the regulated flow of liquid into a holding area where the amount is then measured Water clocks appeared in China as early as 1000 BC. Hour Glass An hourglass measures the passage of a few minutes or an hour of time. The name hourglass comes from historically common hour timing. Factors affecting the time measured include the amount of sand, the bulb size, the neck width, and the sand quality. Introduced to Europe by an 8th-century monk named Luitprand. Pendulum Clocks The first pendulum clock was designed and built by Dutch scientist Christiaan Huygens, in 1656. Early versions where off by less than one minute per day, and later ones only by 10 seconds, very accurate for their time. The wristwatch had already been invented by Patek Philippe, in 1868, but only as a lady’s bracelet watch, intended as jewelry. As pocket watches were unsuitable, Louis Cartier created the Santos wristwatch in 1904, the first man's wristwatch and the first designed for aviation. Wrist Watches Landes, D. (2007, November 27). History of timekeeping devices. Retrieved from http://en.wikipedia.org/wiki/History_of_timekeeping_devices Source:
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