The lever and the pulley
By: by Hal Hellman. Illustrated by Lynn Sweat.
Contributors: Sweat, Lynn, illus.
Publisher: M. Evans; distributed in association with Lippincott, Philadelphia
Published: 1971
Place of publication: New York
Language: eng
Number of pages: 45
Subjects: Levers -- Juvenile literature.; Pulleys -- Juvenile literature.; Levers.; Pulleys.
Description: Describes how levers and pulleys make lifting and moving things easier.