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A clock or chronometer is a device that measures and displays time. The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units such as the day, the lunar month, and the year. Devices operating on several physical processes have been used over the millennia .
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.
The 24th hour on the right side of the dial is typical for the old Italian time system of 24 hours counted from dusk. Clocks and watches with a 24-hour analog dial have an hour hand that makes one complete revolution, 360°, in a day (24 hours per revolution). The more familiar 12-hour analog dial has an hour hand that makes two complete ...
Clock face. A wall clock showing the time at 10:09. A clock face is the part of an analog clock (or watch) that displays time through the use of a flat dial with reference marks, and revolving pointers turning on concentric shafts at the center, called hands. In its most basic, globally recognized form, the periphery of the dial is numbered 1 ...
Windows Desktop Gadgets (called Windows Sidebar in Windows Vista) is a discontinued widget engine for Microsoft Gadgets. Desktop Gadgets have been replaced by Windows 10 Taskbar Widgets. It was introduced with Windows Vista, in which it features a sidebar anchored to the side of the desktop. Its widgets can perform various tasks, such as ...
Quartz clock. Circuit board of an e block from a chronograph -wristwatch. Quartz oscillator crystal on right. Quartz clocks and quartz watches are timepieces that use an electronic oscillator regulated by a quartz crystal to keep time. This crystal oscillator creates a signal with very precise frequency, so that quartz clocks and watches are at ...
German clockmakers. Johann Baptist Beha (1815–1898) Gustav Becker Clock Company; Freiburg in Schlesien, Silesia (1850–1938) Florn. Thomas Haller (Thomas Haller AG), Schwenningen (1880-1900) then merged with Junghans. Thomas Ernst Haller (Haller AG), Schwenningen (1902-1928) then merged with Kienzle.
Clock synchronization. Clock synchronization is a topic in computer science and engineering that aims to coordinate otherwise independent clocks. Even when initially set accurately, real clocks will differ after some amount of time due to clock drift, caused by clocks counting time at slightly different rates.