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  2. Striking clock - Wikipedia

    en.wikipedia.org/wiki/Striking_clock

    Striking clock. The Elizabeth Tower of the Palace of Westminster in London, commonly referred to as Big Ben, is a famous striking clock. A striking clock is a clock that sounds the hours audibly on a bell, gong, or other audible device. In 12-hour striking, used most commonly in striking clocks today, the clock strikes once at 1:00 am, twice at ...

  3. UVB-76 - Wikipedia

    en.wikipedia.org/wiki/UVB-76

    American Radio Relay League: 70–73 – via ProQuest. Perhaps the best-known is the Russian UVB-76, a misheard version of its first call sign, UZB-76. Transmitting on 4625 kHz, it was first noticed around the late 1970s, earning the nickname 'the Buzzer' because of its 24-hour droning hum. ^ "The Buzzer Primer" (PDF).

  4. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    The modern 24-hour clock is the convention of timekeeping in which the day runs from midnight to midnight and is divided into 24 hours. This is indicated by the hours (and minutes) passed since midnight, from 00 (:00) to 23 (:59), with 24 (:00) as an option to indicate the end of the day. This system, as opposed to the 12-hour clock, is the ...

  5. Casio F-91W - Wikipedia

    en.wikipedia.org/wiki/Casio_F-91W

    The watch display shows the day of the week, day of the month, hour, minute, seconds and the signs PM in the afternoon – or 24H (24-hour clock) – at all times, the alarm signal status (bar of vertical lines), and the hourly signal status (double beep on the hour, shown as a bell) are present when activated in the alarm mode.

  6. Four-minute warning - Wikipedia

    en.wikipedia.org/wiki/Four-minute_warning

    The four-minute warning was a central plot and narrative device in dramas (both on stage and screen) and novels, often being the motor force of plays, films, novels and cartoon strips. The BBC drama Threads, about how society decays after a nuclear holocaust, focuses on an attack on Sheffield. The War Game also portrays the four-minute warning ...

  7. WWV (radio station) - Wikipedia

    en.wikipedia.org/wiki/WWV_(radio_station)

    WWV is a shortwave ("high frequency" or HF) radio station, located near Fort Collins, Colorado. It has broadcast a continuous time signal since 1945, and implements United States government frequency standards, with transmitters operating on 2.5, 5, 10, 15, and 20 MHz. [1] WWV is operated by the U.S. National Institute of Standards and ...

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