Describes, in text and illustrations, the evolution of different types of machines, how they work, and their many uses.

Examines the kinds and uses of trains past and present and speculates about the railroads of the future.

Describes the construction of each of the Seven Wonders of the World and relates them to similar structures in ancient and modern times.

Explains how birds fly, discusses the operation and exploits of flying machines, both ancient and modern, and speculates about flight technology of the future.