Newnes is an imprint of ElsevierThe Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, UK30 Corporate Drive, Suite 400, Burlington, MA 01803, USAFirst edition 1999Second edition 2000Third edition 2002Fourth edition 2005Fifth edition 2010Copyright © 2010, John Bird, Published by Elsevier Ltd. All rights reserved.The right of John Bird to be identified as the author of this work has been asserted in accordance withthe Copyright, Designs and Patents Act 1988.No part of this publication may be re