What is sand clock.

1.	What is sand clock.
Answer» Answer: 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»

Answer:

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.

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What is sand clock. ​

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What is sand clock.