Machines
By: [by] Irving and Ruth Adler.
Contributors: Adler, Ruth, joint author.
Series: Their The reason why books
Publisher: John Day Co.
Published: 1964
Place of publication: New York
Language: eng
Number of pages: 47
Subjects: Machinery -- Juvenile literature.; Machinery.; Simple machines.
Description: Discusses machines ranging from such simple ones as the ramp and the crowbar to prime movers which can be powered by atomic energy.