US Library of Congress - How does an hourglass measure time?
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Description: Answers questions about how an hourglass keeps time and what are the contributing factors determining how long an hourglass lasts.
How does an hourglass measure time? (Everyday Mysteries: Fun Science Facts from the Library of Congress) How does an hourglass measure time? By using carefully calculated amounts of sand. The hourglass is sometimes referred to as a sand clock or a sandglass. Like other timepieces, it needs to be carefully calibrated. The hourglass maker must test the instrument and fine tune it to measure the correct length of time.
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| Page title: | How does an hourglass measure time? (Everyday Mysteries: Fun Science Facts from the Library of Congress) |
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| Description: | Question: How does an hourglass measure time? (Everyday Mysteries: Fun Science Facts from the Library of Congress) |
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