Description

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An hourglass (or sandglass, sand timer, sand watch, or sandclock) is a mechanical device used to measure the passage of time.It comprises 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. Factors affecting the timeinterval measured include the sand quantity, the sand coarseness,the bulb size, and the neck width. Hourglasses may be reusedindefinitely by inverting the bulbs once the upper bulb isempty.

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Fun Facts :
Hourglasses were commonly seen in use in churches, homes, and workplaces to measure sermons, cooking time, and time spent on breaksfrom labor. Because they were being used for more everyday tasks,the model of the hourglass began to shrink. The smaller models weremore practical and very popular as they made timing morediscreet.

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