This book is an introduction to the lever, describing three classes of levers, levers from the past, and today's industrial levers.
General Note
Title proper from title frame.
Includes index.
Includes glossary.
Book description - 24 p. : col. ill. ; 21 cm.
Content Note
What is a lever? - How does a lever work? - Different kinds of levers - First-class levers at work - Second- and third-class levers - The earliest levers - Levers today - Using leverage every day - An experiment with levers - You can be a lever, too!.