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 Electronics. In this category "Clock" we have 6 free PNG images with transparent background.

  • Alarm Area Timer Clock Free HQ Image PNG Image
    Alarm Area Timer Clock Free HQ Image
    Format: PNG
    Resolution: 1500x1500
    Size: 69.0KB
    Downloads: 311
  • Art Point Clock Face Digital Line PNG Image
    Art Point Clock Face Digital Line
    Format: PNG
    Resolution: 800x800
    Size: 70.2KB
    Downloads: 216
  • Point Alarm Clock Accessories Face Clocks Home PNG Image
    Point Alarm Clock Accessories Face Clocks Home
    Format: PNG
    Resolution: 600x600
    Size: 40.0KB
    Downloads: 180
  • Wall Green Clock Free Clipart HQ PNG Image
    Wall Green Clock Free Clipart HQ
    Format: PNG
    Resolution: 600x600
    Size: 426.2KB
    Downloads: 82
  • Wall Green Office Clock Free Transparent Image HD PNG Image
    Wall Green Office Clock Free Transparent Image HD
    Format: PNG
    Resolution: 506x505
    Size: 150.2KB
    Downloads: 68
  • Wall Circle Black Clock Free Clipart HQ PNG Image
    Wall Circle Black Clock Free Clipart HQ
    Format: PNG
    Resolution: 512x512
    Size: 187.8KB
    Downloads: 61

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