explain the working of hourglass ⏳
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The hourglass was used to measure time in ancient times. ... The hourglass is commonly known as a sand clock or a sandglass. The hourglass consists oftwo glass bulbs. The two bulbs are connected vertically by a narrow neck that allows a regulated flow of sand from the upper bulb to the lower one.
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Hourglass, an early device for measuring intervals of time
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