_________ is made of two rounded glass bulbs placed one above the other .
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_________ is made of two rounded glass bulbs placed one above the other .
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An hourglass (or sandglass, sand timer, sand clock or egg timer) is a device used to measure the passage of time. It comprises two glass bulbs connected vertically by a narrow neck that allows a regulated flow of a substance (historically sand) from the upper bulb to the lower one.
Answer:
Sand clock
Explanation:
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