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  2. Alarm clock - Wikipedia

    en.wikipedia.org/wiki/Alarm_clock

    This is an accepted version of this page This is the latest accepted revision, reviewed on 17 November 2024. Type of clock A traditional wind-up (key-wound), mechanical spring-powered alarm clock An alarm clock or alarm is a clock that is designed to alert an individual or group of people at a specified time. The primary function of these clocks is to awaken people from their night's sleep or ...

  3. Levi Hutchins - Wikipedia

    en.wikipedia.org/wiki/Levi_Hutchins

    In about 1815, Levi built a large building and set up five looms to manufacture cloth; this business lasted three years before it was sold off. Hutchins continued to build brass clocks, as well as surveying compasses and other precision instruments, for an additional 20 years. He died in Concord on June 13, 1855. [1]

  4. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    An Ancient Egyptian sundial (Rijksmuseum van Oudheden) Vrihat Samrat Yantra, 88 feet (27 m) tall sundial at the Jantar Mantar in Jaipur Built in 1727. The first devices used for measuring the position of the Sun were shadow clocks, which later developed into the sundial.

  5. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    24-hour digital clock in Miaoli HSR station.. A time of day is written in the 24-hour notation in the form hh:mm (for example 01:23) or hh:mm:ss (for example, 01:23:45), where hh (00 to 23) is the number of full hours that have passed since midnight, mm (00 to 59) is the number of full minutes that have passed since the last full hour, and ss (00 to 59) is the number of seconds since the last ...

  6. Digital clock - Wikipedia

    en.wikipedia.org/wiki/Digital_clock

    Digital clocks typically use the 50 or 60 hertz oscillation of AC power or a 32,768 hertz crystal oscillator as in a quartz clock to keep time. Most digital clocks display the hour of the day in 24-hour format; in the United States and a few other countries, a commonly used hour sequence option is 12-hour format (with some indication of AM or PM).

  7. Windows Clock - Wikipedia

    en.wikipedia.org/wiki/Windows_Clock

    Windows Clock (known as Clock & Alarms on Pocket PC 2000, [3] Alarms on Windows 8.1, and, until July 2022, Alarms & Clock on Windows 10) is a time management app for Microsoft Windows, with five key features: alarms, world clocks, timers, a stopwatch, and focus sessions.

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