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  2. Daylight Saving Time: How to set the clock on anything - AOL

    www.aol.com/news/2010-03-12-daylight-saving-time...

    On Sunday clocks around the country will "Spring Ahead" an hour to mark the beginning of Daylight Saving Time. For most of these clocks, on newer devices connected to the Internet, will update to ...

  3. Cavity magnetron - Wikipedia

    en.wikipedia.org/wiki/Cavity_magnetron

    In a radar set, the magnetron's waveguide is connected to an antenna. The magnetron is operated with very short pulses of applied voltage, resulting in a short pulse of high-power microwave energy being radiated. As in all primary radar systems, the radiation reflected from a target is analyzed to produce a radar map on a screen.

  4. 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.