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. You can find out about levers, pulleys, wheels and axles, gears, hydraulics, wind power and much more. It includes 19 practical experiments - make a windmill, a hydraulic lifter and even a vacuum cleaner! Over 260 images include step-by-step photographs and explanatory illustrations. It is an accessible and lively introduction to machines, ideal for home or school use for 8- to 12-year-olds. From sophisticated computers to a simple pair of scissors, we are surrounded by machines. This engaging science book looks at the enormous variety of machines in our world and how they function. Fascinating hands-on projects, such as making your own gears and belt drives, a pulley, a block and tackle, a can crusher, a water wheel, and an Archimedean...
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