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clock - choose a jigsaw puzzle to solve
A clock is an instrument to measure, keep, and indicate time. The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units: the day, the lunar month, and the year. Devices operating on several physical processes have been used over the millennia.
Some predecessors to the modern clock may be considered as "clocks" that are based on movement in nature: A sundial shows the time by displaying the position of a shadow on a flat surface. There is a range of duration timers, a well-known example being the hourglass. Water clocks, along with the sundials, are possibly the oldest time-measuring instruments. A major advance occurred with the invention of the verge escapement, which made possible the first mechanical clocks around 1300 in Europe, which kept time with oscillating timekeepers like balance wheels.
A silent instrument missing such a striking mechanism has traditionally been known as a timepiece. In general usage today, a "clock" refers to any device for measuring and displaying the time. Watches and other timepieces that can be carried on one's person are often distinguished from clocks.
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Puzzlefactory is a place where you can infinitely play assembling online jigsaw puzzles and create new puzzles from your own pictures. Finally you can make interactive puzzle from a photo of your pet or favourite movie and send it to your friends. Please note this site is mainly for children so all improper and unlawful pictures will be removed. For more information please read our terms of use. More about us...
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