What Do Levers Do? (What do... do?)

by David Glover (Author)

• Used

  Hardcover
  1996

  $12.14

• Used

  Paperback
  1997

  $3.44

  Looking at levers, this is one of of a series which aims to develop children's knowledge of the basic principles of design and technology. Each book introduces a particular principle and explores how it is used in different gadgets and machines.