This book is part of a book series called How It Works .

There are 48 pages in this book. This book was published 1995 by Award Publications Ltd .

Bill Gunston is author of numerous books, including "Aviation: The First 100 Years" and "The Encyclopedia of Modern War. " He is a former Royal Air Force pilot and is an Officer of the Order of the British Empire, Fellow of Royal Aeronautical Society. Steve Parker has written numerous science-based titles.