Textbook in PDF format

This book is based upon ideas and mathematical methods developed in the tooling division of the Douglas Aircraft Company. Inc., by J.J. Apalatigui, tooling project supervisor in charge of lines layouts and lofting procedures. It presents an exact approach to a large class of geometrical problems which arise in the lofting, engineering, and tooling of airplanes - and approach which has contributed largely to the ever-increasing demands of the industry for precision manufacturing