This Page Intentionally Left Blank NewnesisanimprintofElsevier LinacreHouse,JordanHill,OxfordOX28DP 30CorporateDrive,Suite400,Burlington,MA01803 Firstedition1990 Secondedition1993 Thirdedition2006 Copyright(cid:2)1990,1993,2006,AustinHughes.PublishedbyElsevierLtd.Allrightsreserved TherightofAustinHughestobeidentifiedastheauthorofthiswork hasbeenassertedinaccordancewiththeCopyright,Designsand PatentsAct1988. Nopartofthispublicationmaybereproduced,storedinaretrievalsystemortransmittedinany formorbyanymeanselectronic,mechanical,photocopying,recordingorotherwisewithoutthe priorwrittenpermissionofthepublisher PermissionsmaybesoughtdirectlyfromElsevier’sScience&TechnologyRightsDepartmentin Oxford, UK:phone(+44) (0) 1865843830;fax(+44) (0) 1865853333;email:permissions@else- vier.com.AlternativelyyoucansubmityourrequestonlinebyvisitingtheElsevierwebsiteathttp:// elsevier.com/locate/permissions,andselectingObtainingpermissiontouseElseviermaterial BritishLibraryCataloguinginPublicationData AcataloguerecordforthisbookisavailablefromtheBritishLibrary LibraryofCongressCataloguinginPublicationData AcataloguerecordforthisbookisavailablefromtheLibraryofCongress ISBN-13:978-0-7506-4718-2 ISBN-10:0-7506-4718-3 ForinformationonallNewnespublications visitourwebsiteathttp://books.elsevier.com/ PrintedandboundinGreatBritain 06 07 08 09 10 10 9 8 7 6 5 4 3 2 1