Euclid's Elements of geometry, [electronic resource] : from the Latin translation of Commandine. To which is added, a treatise of the nature and arithmetic of logarithms; Likewise Another of the Elements of Plane and Spherical Trigonometry; With A Preface, shewing the Usefulness and Excellency of this Work. By Doctor John Keill, F. R. S. and late Professor of Astronomy in Oxford. The Whole Revised; where deficient, Supplied; where lost, or corrupted, Restored. Also, Many Faults committed by Dr. Harris, Mr. Caswell, Mr. Heynes, and other Trigonometrical Writers, are shewn; and in those Cases where They are mistaken, here are given Solutions Geometrically True. An Ample Account of which may be seen in the preface, by Samuel Cunn. The eighth edition, carefully revised and corrected. To which is subjoined an appendix, containing the Investigation of those Series omitted by the Author. And the Difference between Dr. Keill and Mr. Cunn impartially examined and adjusted.