short note on sand clock
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A hourglass is a device is used to mesure the passage of time. it comprises the two glass of bulbs connected vertically by a narrow neck that allows a regulated trickle of material from the upper bulb to the ower one.
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a sand clock is using for see the time .in 8th century the Europeans used this clock . it didn't show the accurate time. it shows one or two minutes only .
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