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US Library of Congress - How does an hourglass measure time?

  Link Details for: US Library of Congress - How does an hourglass measure time?
Link Title: US Library of Congress - How does an hourglass measure time? Open in a new window
Link URL: http://www.loc.gov/rr/scitech/mysteries/hourglass.html
Link Details: Answers questions about how an hourglass keeps time and what are the contributing factors determining how long an hourglass lasts.
Category: Top : Kids_and_Teens : School_Time : Science : Astronomy_and_Space : Time
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US Library of Congress - How does an hourglass measure time?