what is sand clock ?
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An hourglass is a device used to measure the passage of time. It comprises two glass blub connected vertically by a narrowneck that allows a regulated flows of a substances from the upper bulb to the lower one.
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It is also called hourglass. It is a device used to measure the passage of time. It comprises two glass bulbs connecting vertically by a narrow neck that allows regulated flow of a substance from Upper bulb to the lower one.
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