Sandclock Wallpaper

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An hourglass is a mechanical device used to measure the passage of time. It comprises two glass bulbs connected vertically by a narrow neck that allows a regulated trickle of material from the upper bulb to the lower one.

Amazing Sandclock and Time Pictures HD Wallpapers - Digital Art High Definition !

Fun Facts : The origin of the hourglass is unclear. Its predecessor the clepsydra, or water clock, may have been invented in ancient Egypt. According to the American Institute of New York, the clepsammia or sand-glass was invented at Alexandria about 150 BC.

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