Sandclock Wallpaper

Awesome Sandclock Art Wallpapers - Incredible Illustrations - Hourglass Photo Gallery Free !

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 (historically sand) from the upper bulb to the lower one.

Sandclock and Time Images HD - Digital Wallpapers in High Definition !

Factors affecting the time interval measured include the sand quantity, the sand coarseness, the bulb size, and the neck width. Hourglasses may be reused indefinitely by inverting the bulbs once the upper bulb is empty.

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