Question

a clock based on the principle of falling of sand

Answer 1

Sand clock is made up of two rounded glass bulbs which are connected by a narrow neck of glass. It is based on the principle that sand from the upper glass bulb falls into the lower glass bulb in a fixed time so it became the unit of time.

Answer 2

Answer:

sand clock

Explanation:

used by ancient civilizations

was a symbol of luxury and royalty

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