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, Find out about levers, pulleys, wheels and axles, gears, hydraulics, wind power and more, Includes 19 practical experiments - make a windmill, an Archimedean screw and even your very own vacuum cleaner!, Over 260 images include step-by-step photographs and explanatory illustrations, An accessible and lively introduction to machines, ideal for I home or school use for 8- to 12-year-olds