Question

What was the principle on which the sand clock used by Romans worked?​

Answer 1

Answer:

It works in principle that when sand become hot they felt that it is afternoon and when sand become cool they felt that it is evening time

Explanation:

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Answer 2

An hourglass is a device used to measure the passage of time. It comprises two glass bulbs ... Hourglasses were commonly seen in use in churches, homes, and work places ...