|aThe big book of how things work /|cPeter Lafferty.
260
|bHamlyn,|c1990.
300
|a79 p. :|bill ;|c35 cm.
504
|aIncludes indexes.
520
|aThis exciting book will tell you everything you need to know about how a wide variety of things work, from a traditional pendulum clock to a complex, modern laser.This straighforward text and striking illustrations make thes an essential guide to the working world.