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: 1830x2554
  Size: 2.0MB
  Downloads: 361
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  Wristwatch Png Image
  Format: PNG
  Resolution: 2188x3520
  Size: 3.1MB
  Downloads: 365
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  Clock Png Image
  Format: PNG
  Resolution: 250x250
  Size: 32.4KB
  Downloads: 398
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  Wall Green Clock Free Download PNG HD
  Format: PNG
  Resolution: 2002x989
  Size: 308.1KB
  Downloads: 88
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  Wall Green Clock Free Clipart HQ
  Format: PNG
  Resolution: 1100x1100
  Size: 1.2MB
  Downloads: 84
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  Alarm Clock Png Image
  Format: PNG
  Resolution: 658x870
  Size: 162.0KB
  Downloads: 376
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  Digital Clock Image
  Format: PNG
  Resolution: 665x423
  Size: 135.4KB
  Downloads: 297
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  Wall Clock Png Image
  Format: PNG
  Resolution: 900x900
  Size: 365.5KB
  Downloads: 366
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  Clock Png Image
  Format: PNG
  Resolution: 1772x1779
  Size: 1.1MB
  Downloads: 390
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  Wall Vector Black Clock PNG Image High Quality
  Format: PNG
  Resolution: 600x598
  Size: 47.7KB
  Downloads: 85
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  Wall Big Black Clock HQ Image Free
  Format: PNG
  Resolution: 512x512
  Size: 84.6KB
  Downloads: 94
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  Clock Hands Transparent Image
  Format: PNG
  Resolution: 600x600
  Size: 67.7KB
  Downloads: 372
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  Wristwatch Png Image
  Format: PNG
  Resolution: 777x1428
  Size: 368.5KB
  Downloads: 373
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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 Photos Circle Green Clock
  Format: PNG
  Resolution: 718x718
  Size: 55.2KB
  Downloads: 81
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  Clock Png Picture
  Format: PNG
  Resolution: 256x256
  Size: 54.5KB
  Downloads: 356
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  Clock Free Png Image
  Format: PNG
  Resolution: 999x999
  Size: 341.1KB
  Downloads: 408
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  Wall Clock Green Classic Free Transparent Image HQ
  Format: PNG
  Resolution: 852x851
  Size: 30.7KB
  Downloads: 98
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  Clock Hands Transparent
  Format: PNG
  Resolution: 2244x2244
  Size: 248.9KB
  Downloads: 388
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  Digital Clock Transparent Background
  Format: PNG
  Resolution: 437x143
  Size: 26.6KB
  Downloads: 304

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