How and Why Wonder Book of MACHINES #5012 (1960)
$6.95Price
The How and Why Wonder Book of MACHINES (#5012). Wonder Books, New York, 1960.
Children's Educational Book
Six Basic Principles of Machines
No matter how complex today's machines appear, they are just combinations of the six basic machines:
1). the lever;
2). the inclined plane;
3). the wedge;
4). the screw;
5). the wheel & axle; and,
6). the pulley.
Includes several interesting experiments.
Over-sized paperback has full color cover. Copyright 1960. Printed in U.S.A. Wonder catalog #5012 in "The How and Why Wonder Book of" series. First Edition.
Cover with small tears and creases. 48 page softcover children's book.