Simplified Roof Framing Author:J. D. Wilson This book has been designed to be accessible to skilled mechanics in construction who do not have a working knowledge of mechanical drawing, geometry, or trigonometry. The subject matter has been given a thorough try-out in evening school work and has proved successful. — The material is organized so that each chapter represents a typical roof. E... more »ach section of the chapter is devoted to a rafter. So you can study each separately or together.« less