An hourglass (or sandglass, sand timer, sand watch, orsandclock) is a mechanical device used to measure the passage oftime.It comprises two glass bulbs connected vertically by a narrowneckthat allows a regulated trickle of material (historicallysand)from the upper bulb to the lower one.
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Factors affecting the time interval measured include thesandquantity, the sand coarseness, the bulb size, and the neckwidth.Hourglasses may be reused indefinitely by inverting the bulbsoncethe upper bulb is empty.
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