Originally published in 1859, this early work by English Mathematician Isaac Todhunter is both expensive and hard to find in its first edition. It contains a wealth of information on spherical trigonometry and includes chapters on Geodetical Operations, Polyhedrons, Spherical Geometry and much more. This fascinating work is thoroughly recommended for all students of mathematics looking to advance their knowledge of the subject. Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.