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An hourglass (or sandglass, sand timer, sand watch, or sand clock)is a mechanical device used to measure the passage of time. Itcomprises two glass bulbs connected vertically by a narrow neckthat allows a regulated trickle of material (historically sand)from the upper bulb to the lower one.

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Fun Facts :
Factors affecting the time interval measured include the sandquantity, the sand coarseness, the bulb size, and the neck width.Hourglasses may be reused indefinitely by inverting the bulbs oncethe upper bulb is empty.

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