How an Hourglass Measures Time × Share this item × Favorite this item In order to favorite a resource, you are required to login. × Flag this item Type * - None - Graphic Violence Graphic Sexual Content Spam, Scam or Fraud Broken or Empty Data Details * Students learn about the many factors which contribute to the accuracy of an hourglass. https://web.archive.org/web/20200306043415/https://www.loc.gov/everyday-mysteries/item/how-does-an-hourglass-measure-time/
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