Screws

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Heinemann-Raintree Library, 2006 - Juvenile Nonfiction - 24 pages
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How are a boat propeller, water faucet, and spiral staircase alike? How can a screw keep your soda pop from getting flat? How can a screw help you plant a tree? Why might a large wrench work better than a small one? This title shows you how different kinds of these simple machines are all around you to make your work and play easier.
  

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About the author (2006)

David Glover is a Heinemann-Raintree author.

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