An Elementary Course in Synthetic Projective Geometry by Derrick Norman Lehmer is a foundational mathematics textbook that introduces readers to the principles and methods of synthetic projective geometry. Designed for students and enthusiasts with a basic understanding of geometry, the book systematically explores the subject without relying on algebraic methods, focusing instead on pure geometric reasoning and construction. Beginning with fundamental concepts such as points, lines, and planes, the text delves into the properties and relationships that define projective geometry, including the notions of incidence, harmonic division, cross-ratio, and perspectivity. Lehmer’s clear and logical exposition guides readers through the development of the subject, starting from simple axioms and building up to more complex theorems and constructions. The book covers essential topics such as projective transformations, the principle of duality, conic sections, and the role of infinity in geometry. Numerous diagrams and illustrative examples help clarify abstract concepts, making the material accessible to those new to the field. Throughout, the author emphasizes the elegance and power of synthetic methods, encouraging readers to appreciate the beauty of geometric reasoning. Exercises at the end of each chapter provide opportunities for practice and deeper understanding. An Elementary Course in Synthetic Projective Geometry remains a valuable resource for students, teachers, and anyone interested in the logical structure and creative possibilities of projective geometry.