An?hourglass?(or?sandglass,?sand timer, or?sand clock) is a 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. Factors affecting the time interval measured include sand quantity, sand coarseness, bulb size, and neck width. Hourglasses may be reused indefinitely by inverting the bulbs once the upper bulb is empty.








MAECENAS IACULIS
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ADIPISCING CONVALLIS BULUM
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- Abitur parturient praesent lectus quam a natoque adipiscing a vestibulum hendre.
- Diam parturient dictumst parturient scelerisque nibh lectus.
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