Question 9
What does an hour glass use to measure time?
Answer Options
O The angle of the sun
O The to and fro motion of a pendulum
O The amount of sand streaming down
O The angle of the moon
plz answer a b c d
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Hourglass, an early device for measuring intervals of time. It is also known as a sandglass or a log glasswhen used in conjunction with the common log for ascertaining the speed of a ship. It consists of two pear-shaped bulbs of glass, united at their apexes and having a minute passage formed between them.
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