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  2. 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 ...

  3. Doomsday Clock - Wikipedia

    en.wikipedia.org/wiki/Doomsday_Clock

    Doomsday Clock. The Doomsday Clock is a symbol that represents the likelihood of a human-made global catastrophe, in the opinion of the members of the Bulletin of the Atomic Scientists. [ 1] Maintained since 1947, the clock is a metaphor, not a prediction, for threats to humanity from unchecked scientific and technological advances.

  4. 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 ]

  5. Atomic clock - Wikipedia

    en.wikipedia.org/wiki/Atomic_clock

    Louis Essen (right) and Jack Parry (left) standing next to the world's first caesium-133 atomic clock in 1955, at the National Physical Laboratory in west London.. The Scottish physicist James Clerk Maxwell proposed measuring time with the vibrations of light waves in his 1873 Treatise on Electricity and Magnetism: 'A more universal unit of time might be found by taking the periodic time of ...

  6. World Clock (Alexanderplatz) - Wikipedia

    en.wikipedia.org/wiki/World_Clock_(Alexanderplatz)

    The World Clock ( German: Weltzeituhr; German pronunciation: [ˈvɛltt͡saɪ̯tˌʔuːɐ̯] ⓘ ), also known as the Urania World Clock (German: Urania-Weltzeituhr ), is a large turret-style world clock located in the public square of Alexanderplatz in Mitte, Berlin. By reading the markings on its metal rotunda, the current time for 148 major ...

  7. List of clock manufacturers - Wikipedia

    en.wikipedia.org/wiki/List_of_clock_manufacturers

    Edward East, clockmaker to King Charles I. Chas Goodall (Clockmaker)1793-1818 26 Bridges St, Covent Garden. [ 5] George Graham (7 July 1673 – 20 November 1751) a partner of Thomas Tompion. Frank Hope-Jones (1867-1950) Joseph Johnson; Liverpool (1795–1827) Thomas Kefford ( fl. 1710–1750).

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