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  2. Big Ben - Wikipedia

    en.wikipedia.org/wiki/Big_Ben

    Big Ben is the nickname for the Great Bell of the Great Clock of Westminster, [1][2] and, by extension, for the clock tower itself, [3] which stands at the north end of the Palace of Westminster in London, England. [4] Originally known simply as the Clock Tower, it was renamed Elizabeth Tower in 2012 to mark the Diamond Jubilee of Elizabeth II.

  3. Mengenlehreuhr - Wikipedia

    en.wikipedia.org/wiki/Mengenlehreuhr

    The clock at its original location in May 1979, displaying 17:54 (5:54pm). The Mengenlehreuhr (German for " Set Theory Clock") or Berlin-Uhr (" Berlin Clock") is the first public clock in the world that tells the time by means of illuminated, coloured fields, for which it entered the Guinness Book of Records upon its installation on 17 June 1975.

  4. Seven-segment display - Wikipedia

    en.wikipedia.org/wiki/Seven-segment_display

    Seven-segment display. A typical 7-segment LED display component, with decimal point in a wide DIP -10 package. A seven-segment display is a form of electronic display device for displaying decimal numerals that is an alternative to the more complex dot matrix displays. Seven-segment displays are widely used in digital clocks, electronic meters ...

  5. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    The tower clock of Norwich Cathedral constructed c. 1273 (reference to a payment for a mechanical clock dated to this year) is the earliest such large clock known. The clock has not survived. [95] The first clock known to strike regularly on the hour, a clock with a verge and foliot mechanism, is recorded in Milan in 1336. [96]

  6. Radium dial - Wikipedia

    en.wikipedia.org/wiki/Radium_dial

    Radium dial. A 1950s radium clock, exposed to ultraviolet light to increase luminescence. Radium dials are watch, clock and other instrument dials painted with luminous paint containing radium-226 to produce radioluminescence. Radium dials were produced throughout most of the 20th century before being replaced by safer tritium -based luminous ...

  7. 24-hour analog dial - Wikipedia

    en.wikipedia.org/wiki/24-hour_analog_dial

    Using the numbers from 0 to 23 (or 1 to 24) to mark the day is the 24-hour clock system. Sundials use 24-hour analog dials—the shadow traces a path that repeats approximately once per day. Many sundials are marked with the double-XII or double-12 system, in which the numbers I to XII (or 1 to 12) are used twice, once for the morning hours ...

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