Question

write the functions of a sand clock​

Answer 1

To tell time

Normaly a old time sand clock is of half an hour

Answer 2

Explanation:

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.