Marvelous Machine ProjectsBook - 1999
Introduces the workings of various kinds of simple machinery with moving parts, such as pulleys, levers, gears, cams, and conveyor belts and provides instructions for building these machines out of cardboard and other easily obtainable materials.
Publisher: Minneapolis : Lerner Publications, 1999.
Edition: U.S. ed. --
Characteristics: 30 p. :,col. ill. --