This textbook is designed to develop an understanding of geometrical applications for students in carpentry, millwork, building, and drafting courses. Each unit starts with simple exercises and moves to more complex assignments. PUBLISHER'S NOTE: This book was originally published more than two decades ago. While every effort has been taken to ensure copies printed today are comparable in quality to those printed when the book was first published, in some cases illustrations and diagrams used in the original book were relatively small (though legible) and in other instances had to be scanned from archival copies. The information included in the book remains uniquely valuable, but we do want readers to know that in some places the layout of this book may not reach the level of sophistication expected of a new publication today.