what does an hour glass used to measure time one word answer
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Hourglass, an early device for measuring intervals of time. It is also known as a sandglass or a log glass when 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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An hourglass is an instrument with two glass bulbs joined by a narrow neck.sand is filled in it.it is an ancient instrument But it does not tell correct time
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