Exploring and understanding machines.
Series: Exploring and understanding science series. Matter and energy
Publisher: Benefic Press
Published: 1969
Place of publication: Westchester, Ill
Language: eng
Number of pages: 96
Subjects: Machinery -- Juvenile literature.; Machinery.
Description: A survey of machines through history, discussing their efficiency and some of the major inventions that made new machines possible: lever, wheel and axle, pulley, inclined plane, wedge, and screw.