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.

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

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