Engines Animated

Engines Animated, a board book targeted at 0-2 year olds, tells the story of the development of engines in the world and explains the various types of engines and how they work.

Here's the text from a sample page, to give you a sense of the writing:

“In a STEAM ENGINE, when the piston lifts up, the tube fills with steam. Cold water sprays in a turns the steam back into the liquid. This creates a vacuum that sucks the piston back down, and the whole process starts over again.”

The movable illustration on this page lifts a purple bar that barely touches a fan-shaped object above and to the left of it.