Elements of the Conic Sections is a mathematical textbook written by Robert Simson and first published in 1809. The book covers the properties and applications of conic sections, which are curves formed by the intersection of a plane with a cone. Simson's approach to the subject is both rigorous and accessible, making the book suitable for both students and professionals in the field of mathematics. The text includes numerous diagrams and examples to aid in understanding the concepts presented. The book is divided into three parts, covering the ellipse, parabola, and hyperbola. Each section includes a detailed explanation of the properties and equations of the corresponding conic section, as well as examples of how they can be used in practical applications. Overall, Elements of the Conic Sections is an important work in the history of mathematics and remains a valuable resource for anyone studying conic sections.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.