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Fitbit Ultra activity tracker in teal clipped to pocket. The Fitbit Ultra was announced on October 3, 2011. [18] The new features included: an altimeter that measures elevation gain in terms of floors, with one floor roughly equivalent to ten feet; a digital clock visible on the device's display; a stopwatch that can be used to time activities
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The next 3 decades saw the development of quartz clocks as precision time standards in laboratory settings; the bulky delicate counting electronics, built with vacuum tubes, limited their use elsewhere. In 1932 a quartz clock was able to measure tiny variations in the rotation rate of the Earth over periods as short as a few weeks. [39]
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A quantum clock is a type of atomic clock with laser cooled single ions confined together in an electromagnetic ion trap. Developed in 2010 by physicists at the U.S. National Institute of Standards and Technology , the clock was 37 times more precise than the then-existing international standard. [ 1 ]
Clock signal and legend. In electronics and especially synchronous digital circuits, a clock signal (historically also known as logic beat) [1] is an electronic logic signal (voltage or current) which oscillates between a high and a low state at a constant frequency and is used like a metronome to synchronize actions of digital circuits.
Examples of the reset button technique include dream sequences, alternate-history flashbacks, parallel universes, alternate realities, alternate timelines, daydreams, time travel, and hallucinations. In one trope that uses this technique (typically in science fiction or fantasy), a character will find themselves in a situation that seems ...