Question

what is an hourglass​

Answer 1

Answer:

a timing device with two connected glass bulbs containing sand that takes an hour to pass from the upper to the lower bulb.

Answer 2

Answer:

, 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 trickle of material (historically sand) from the upper bulb to the lower one.

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