PREFACEIN adding to the' alread~' long and excellent list of texts onDescriptive Geometry, the writers have not attempted topresent any new abstract material nor even to include all of thestandard problems. On the other hand, they have sought toavoid a presentation which dwells solely o~ the practical sideof the subject.The value of Descriptive Geometry in developing the imagination,through the ability to visualize, has, for a long time, beenfully recognized, not only in the schools, but also by men whohave won recognition and maturity in the practice of theirprofessions. The average technical student, however, whileeager in the pursuit of any subject which seems to offer animmediate and definite return, is reluctant to apply himself toa subject whose value is not at once apparent.In preparing this text, the attempt has been made to holdthe student's attention by means of introductory paragraphsand 'other explanatory matter intended to show the relTable of Contents CONTENTS; CHAPTER PAGE; I PURPOSE AXD SCOPE 1; II PROJECTIOX OF POIXTS 10; III PROJECTIOX OF LIXES 20; IV PROJECTIOX OF POIXTS AXD LIXES IX THE SECOND, THIRD; AND FOURTH QUADRAXTS 42; V PLAXE FIGURES AXD SOLIDS 53; VI PROBLE~IS DEALIXG WITH POIXTS, LnES, A!D PLANES 66; VII CURVED LINES 119; VIII CUR"ED SURFACES 153; IX ApPLICATIOXS FOR CHAPTERS I TO V 204; X ApPLICATIOXS FOR CHAPTER VI 212; XI ApPLICATIONS FOR CHAPTERS VII AXD YIII 226; XII SHADES AXD SHADOWS 242; XIII OTHER :IETHOD