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An hourglass is a mechanical device used to measure the passage oftime. It comprises two glass bulbs connected vertically by a narrowneck that allows a regulated trickle of material from the upperbulb to the lower one. Factors affecting the time interval measuredinclude the sand quantity, the sand coarseness, the bulb size, andthe neck width. Hourglasses may be reused indefinitely by invertingthe bulbs once the upper bulb is empty.

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The origin of the hourglass is unclear. Its predecessor theclepsydra, or water clock, may have been invented in ancient India.According to the American Institute of New York, the clepsammia orsand-glass was invented at Alexandria about 150 BC.

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