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A clock is a mechanical or electrical device that is designed for measuring time.
The first device used for measuring the time was a sundial, a device that tells the time by the position of the Sun. It displays the position of a shadow on a flat surface on a sunny day. On the other hand, it is also known that many ancient civilizations used various methods before sundials like stone circles to time seasonal events.
A water clock is one of the oldest time-measuring instruments along with sundials. It measures the time by the regulated flow of liquid into or out from a vessel. Water clocks were commonly used in ancient Greece, where they were introduced by Plato, who also invented a water-based alarm clock.
A mechanical clock keeps track of the time by using the verge escapement mechanism, an important technology that made possible the development of all-mechanical clocks. They tracked time more accurately than sundials or water clocks. It is thought that they were invented in Europe at around the start of the 14th century.
A pendulum clock is a precise timekeeper that uses a pendulum as its timekeeping element. It was the standard timekeeping device in Europe from the time it was invented in 1656 by the Dutch horologist Christiaan Huygens, until the 1930s. Therefore, many credit Huygens as the inventor of modern clocks, and one of the best watchmakers of all time.
Unlike mechanical clocks that are powered by hanging weight, an electric clock is a clock powered by electricity, invented in 1815 by Francis Ronalds. In the 1930s, the synchronous electric clocks replaced mechanical clocks as the standard timekeeping device in the world.
A quartz clock is an electronic oscillator powered clock which is regulated by a quartz crystal, a hard, crystalline mineral composed of silicon and oxygen atoms. The first quartz clock was built in 1927 at Bell Telephone Laboratories.
An atomic clock is a type of clock that uses atomic transitions to measure the time precisely. Today, atomic clocks are the most accurate timekeeping device in practical use.
The online clock is a digital clock that can display the current time based on your computer time in 12h or 24h format with seconds, minutes, hours, and the date.
Unlike the Online Timer, you do not need to do anything specific to use the Online Clock. It automatically shows the real-time based on your computer time and can display a large clock on screen as it is also available in full screen.
An analog clock is a type of clock where the time is represented by hands, which spin around a dial, pointing to a number. A digital clock is a clock that displays the time digitally on a screen, usually made out of a specific type of glass that let the light out.
A standard watch displays only the time while a chronograph is a time recording timepiece that can be used as a stopwatch and a display watch.