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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  Alarm Clock
  Format: PNG
  Resolution: 555x785
  Size: 152.5KB
  Downloads: 337
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  Clock Png Images
  Format: PNG
  Resolution: 400x400
  Size: 48.8KB
  Downloads: 336
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  Clock Hands Image
  Format: PNG
  Resolution: 1000x1000
  Size: 74.6KB
  Downloads: 336
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  Clock Png Image
  Format: PNG
  Resolution: 1494x1495
  Size: 695.1KB
  Downloads: 335
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  Clock High-Quality Png
  Format: PNG
  Resolution: 499x499
  Size: 126.5KB
  Downloads: 332
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  Clock Png Image
  Format: PNG
  Resolution: 1762x1782
  Size: 1.6MB
  Downloads: 328
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  Alarm Clock Png Image
  Format: PNG
  Resolution: 1592x2181
  Size: 1.3MB
  Downloads: 327
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  Digital Clock
  Format: PNG
  Resolution: 600x226
  Size: 16.2KB
  Downloads: 327
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  Vintage Clock Clipart
  Format: PNG
  Resolution: 1372x1372
  Size: 71.8KB
  Downloads: 326
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  Clock Hands Clipart
  Format: PNG
  Resolution: 400x400
  Size: 43.6KB
  Downloads: 321
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  Alarm Clock Image
  Format: PNG
  Resolution: 1616x2223
  Size: 2.3MB
  Downloads: 319
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  Clock Png Image
  Format: PNG
  Resolution: 1021x1024
  Size: 498.1KB
  Downloads: 317
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  Alarmclock Png Image
  Format: PNG
  Resolution: 512x512
  Size: 50.6KB
  Downloads: 309
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  Vintage Clock
  Format: PNG
  Resolution: 600x600
  Size: 502.7KB
  Downloads: 308
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  Clock Png Image
  Format: PNG
  Resolution: 580x600
  Size: 91.3KB
  Downloads: 305
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  Clock Hands File
  Format: PNG
  Resolution: 1000x1000
  Size: 58.1KB
  Downloads: 305
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  Digital Clock Transparent Background
  Format: PNG
  Resolution: 437x143
  Size: 26.6KB
  Downloads: 304
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  Digital Clock Transparent Image
  Format: PNG
  Resolution: 600x289
  Size: 49.4KB
  Downloads: 304
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  Digital Clock Clipart
  Format: PNG
  Resolution: 564x423
  Size: 131.2KB
  Downloads: 303
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  Clock Png Image
  Format: PNG
  Resolution: 2285x2356
  Size: 941.3KB
  Downloads: 300

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