The first American alarm clock was created in 1787 by Levi Hutchins in Concord, New Hampshire. This device he made only for himself however, and it only rang at 4 am, in order to wake him for his job. The French inventor Antoine Redier was the first to patent an adjustable mechanical alarm clock, in 1847. See more An alarm clock or alarm is a clock that is designed to alert an individual or group of individuals at a specified time. The primary function of these clocks is to awaken people from their night's sleep or short naps; they can … See more A clock radio is an alarm clock and radio receiver integrated in one device. The clock may turn on the radio at a designated time to … See more Computer alarms Alarm clock software programs have been developed for personal computers. There are See more Time switches can be used to turn on anything that will awaken a sleeper, and can therefore be used as alarms. Lights, bells, and radio and … See more Traditional analogue clocks Traditional mechanical alarm clocks have one or two bells that ring by means of a mainspring that powers a gear to quickly move a hammer back and forth between the two bells or between the internal sides of a single bell. In … See more The ancient Greek philosopher Plato (428–348 BC) was said to possess a large water clock with an unspecified alarm signal similar to the sound of a water organ; he used it at night, possibly for signaling the beginning of his lectures at dawn (Athenaeus 4.174c). … See more Scientific studies on sleep having shown that sleep stage at awakening is an important factor in amplifying sleep inertia. Alarm clocks involving sleep stage monitoring … See more Web1 day ago · HERMIC Digital Alarm Clock Bedside Mains Powered Large Digital Led Display, £9.99 + £3.00 Postage. Alarm Clock Bicycle Bike Home Decor Table Bedside Quartz Analog Dial Desk Gift. £7.07. ... A1 first class thank you. DVD Writer SU-208 internal drive from Toshiba Satellite Laptop 50t (#202809055640) See all Feedback.
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