A Clock is a device used to keep, measure and indicate time. Clocks are said to be one of the oldest inventions of the human being, meeting a dire need to measure intervals of time shorter than the natural units like the day or the lunar month or the period of the entire year. Devices working on various physical processes have been used over a very long time. Some of the predecessors of the modern clock were often based on the movement of nature and were also termed as clocks. The one which shows time by representing the shadow of the sun on a flat surface is called a sundial. In order to measure the duration time, instruments like hourglass have been used. There are also water clocks which are considered to be one of the oldest time measuring devices. The major advancement came into the manufacturing system of clocks after the invention of verge escapement, which made possible the production of the first mechanical clock in 1300s in Europe. It used to keep time with oscillating timekeepers like balance wheels.
In horology, traditionally the clocks which did not strike hourly with some sound were known to be a timepiece and the one which produce the strike sound was called a clock.

In this sub category you can download free PNG images: Clock Objects. In this category "Clock" we have 159 free PNG images with transparent background.

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  Clock Png Image
  Format: PNG
  Resolution: 1399x1398
  Size: 976.3KB
  Downloads: 403
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  Wall Green Office Clock PNG Free Photo
  Format: PNG
  Resolution: 500x500
  Size: 83.3KB
  Downloads: 58
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  Wristwatch Png Image
  Format: PNG
  Resolution: 800x1000
  Size: 230.5KB
  Downloads: 839
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  Wall Clock Png Image
  Format: PNG
  Resolution: 1775x1780
  Size: 1.1MB
  Downloads: 1,257
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  Wall Circle Green Clock Free Photo
  Format: PNG
  Resolution: 640x480
  Size: 57.4KB
  Downloads: 70
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  Clock Png Image
  Format: PNG
  Resolution: 1204x1526
  Size: 443.8KB
  Downloads: 449
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  Wall Black Clock PNG Image High Quality
  Format: PNG
  Resolution: 1280x1280
  Size: 406.2KB
  Downloads: 91
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  Alarm Clock
  Format: PNG
  Resolution: 555x785
  Size: 152.5KB
  Downloads: 337
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  Wristwatch Png Image
  Format: PNG
  Resolution: 1000x1000
  Size: 282.7KB
  Downloads: 673
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  Wall Photos Green Clock Download HD
  Format: PNG
  Resolution: 1023x1028
  Size: 1.6MB
  Downloads: 62
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  Clock Hands
  Format: PNG
  Resolution: 550x550
  Size: 74.5KB
  Downloads: 413
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  Vintage Clock Image
  Format: PNG
  Resolution: 1524x1270
  Size: 309.9KB
  Downloads: 401
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  Clock Png Image
  Format: PNG
  Resolution: 900x906
  Size: 407.3KB
  Downloads: 437
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  Vintage Clock Transparent
  Format: PNG
  Resolution: 500x532
  Size: 408.8KB
  Downloads: 363
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  Clock Png Image
  Format: PNG
  Resolution: 1119x2628
  Size: 729.9KB
  Downloads: 387
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  Point House Astrology Angle Horoscope Download Free Image
  Format: PNG
  Resolution: 589x595
  Size: 64.9KB
  Downloads: 188
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  Clock Png Image
  Format: PNG
  Resolution: 1050x1500
  Size: 274.8KB
  Downloads: 417
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  Clock Png Image
  Format: PNG
  Resolution: 1000x1000
  Size: 456.2KB
  Downloads: 338
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  Clock Png Clipart
  Format: PNG
  Resolution: 434x434
  Size: 7.3KB
  Downloads: 836
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  Clock Png Image
  Format: PNG
  Resolution: 1563x1540
  Size: 878.5KB
  Downloads: 437

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