Good, Keith

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.

Includes instructions for a variety of projects made with molding materials and encourages readers to create their own designs.

Presents projects for constructing and testing a variety of structures, including bridges, domes, and collapsible structures, and encourages readers to design their own.

Introduces the basics behind the operation of various battery-powered electrical devices and provides instructions for making some simple devices that use different kinds of circuits and switches.