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  2. Pomodoro Technique - Wikipedia

    en.wikipedia.org/wiki/Pomodoro_Technique

    A pomodoro kitchen timer. The Pomodoro Technique is a time management method developed by Francesco Cirillo in the late 1980s. It involves breaking work into intervals, traditionally 25 minutes in length, separated by short breaks. Each interval is known as a pomodoro, named after the tomato-shaped kitchen timer Cirillo used during university ...

  3. 555 timer IC - Wikipedia

    en.wikipedia.org/wiki/555_timer_IC

    A second resistor in parallel, the new timing is half the table time. A second resistor in series, the new timing is double the table time. 2.5 ms (0.25x) ≅ 100 nF and 22.75 kΩ (four 91 kΩ resistors in parallel), 5 ms (0.5x) ≅ 100 nF and 45.5 kΩ (two 91 kΩ resistors in parallel), 10 ms (1x) ≅ 100 nF and 91 kΩ (values from table),

  4. 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 25 February 2025. 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 ...

  5. Four-minute warning - Wikipedia

    en.wikipedia.org/wiki/Four-minute_warning

    The four-minute warning was a public alert system conceived by the British Government during the Cold War and operated between 1953 and 1992. The name derived from the approximate length of time from the point at which a Soviet nuclear missile attack against the United Kingdom could be confirmed and the impact of those missiles on their targets.

  6. File:Doomsday clock (5 minutes).svg - Wikipedia

    en.wikipedia.org/wiki/File:Doomsday_clock_(5...

    Date/Time Thumbnail Dimensions User Comment; current: 23:13, 7 November 2023: 512 × 512 (480 bytes): Minoa: Syntax optimised/validated and title added, all by prior arrangement (see User talk:Ryanicus Girraficus#Doomsday Clock SVG update).

  7. Repeater (horology) - Wikipedia

    en.wikipedia.org/wiki/Repeater_(horology)

    The decimal repeater works like the minute repeater, but instead of chiming the quarter hours followed by minutes, it sounds the number of ten-minute intervals after the last hour and then the minutes. For example, if the time is 2:49 then the decimal repeater will sound 2 low tones representing 2 hours, 4 sequence tones representing 40 minutes ...

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  9. Time bomb - Wikipedia

    en.wikipedia.org/wiki/Time_bomb

    A time bomb's timing mechanism may be professionally manufactured either separately or as part of the device, or it may be improvised from an ordinary household timer such as a wind-up alarm clock, wrist watch, digital kitchen timer, or notebook computer. The timer can be programmed to count up or count down (usually the latter; as the bomb ...