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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  Wall Clock Green Classic Free Photo
  Format: PNG
  Resolution: 512x512
  Size: 93.8KB
  Downloads: 73
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  Wall Golden Black Clock Free Transparent Image HQ
  Format: PNG
  Resolution: 500x500
  Size: 133.8KB
  Downloads: 72
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  Wall Black Round Clock PNG File HD
  Format: PNG
  Resolution: 1456x1460
  Size: 706.8KB
  Downloads: 71
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  Wall Black Numbers Clock Download HD
  Format: PNG
  Resolution: 1024x838
  Size: 241.6KB
  Downloads: 70
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  Wall Circle Green Clock Free Photo
  Format: PNG
  Resolution: 640x480
  Size: 57.4KB
  Downloads: 70
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  Wall Circle Green Clock Free Transparent Image HQ
  Format: PNG
  Resolution: 3384x3726
  Size: 1.9MB
  Downloads: 70
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  Wall Vector Black Clock Free HD Image
  Format: PNG
  Resolution: 750x750
  Size: 87.8KB
  Downloads: 68
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  Wall Green Office Clock PNG Free Photo
  Format: PNG
  Resolution: 700x700
  Size: 429.1KB
  Downloads: 68
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  Wall Circle Green Clock Free Download Image
  Format: PNG
  Resolution: 851x852
  Size: 40.4KB
  Downloads: 63
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  Wall Photos Green Clock Download HD
  Format: PNG
  Resolution: 1023x1028
  Size: 1.6MB
  Downloads: 62
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  Wall Clock Green Classic Free PNG HQ
  Format: PNG
  Resolution: 500x496
  Size: 53.0KB
  Downloads: 60
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  Wall Green Office Clock Download HQ
  Format: PNG
  Resolution: 512x512
  Size: 326.5KB
  Downloads: 60
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  Wall Photos Clock Green Classic
  Format: PNG
  Resolution: 1080x1080
  Size: 846.7KB
  Downloads: 59
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  Wall Green Clock HD Image Free
  Format: PNG
  Resolution: 1100x1100
  Size: 1.6MB
  Downloads: 59
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  Wall Green Office Clock HQ Image Free
  Format: PNG
  Resolution: 1008x1024
  Size: 595.7KB
  Downloads: 59
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  Wall Green Office Clock PNG Free Photo
  Format: PNG
  Resolution: 500x500
  Size: 83.3KB
  Downloads: 58
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  Wall Drawn Hand Black Clock
  Format: PNG
  Resolution: 512x512
  Size: 16.8KB
  Downloads: 57
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  Wall Black Clock Free Download Image
  Format: PNG
  Resolution: 1375x1366
  Size: 1.4MB
  Downloads: 46
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  Wall Circle Green Clock Download HQ
  Format: PNG
  Resolution: 1200x1200
  Size: 294.6KB
  Downloads: 44

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