Find Out About Machines: With 19 projects and more than 260 pictures

Discover what machines are, how they work, and how they have developed through history, in this fascinating fact file and learn-it-yourself project book. Includes 19 practical experiments - make a windmill, a hydraulic lifter and even a vacuum cleaner! An accessible and lively introduction to machines, ideal for home or school use for 8 to 12 year olds.