Euclid's elements [electronic resource] : of geometry, from the Latin translation of Commandine. To which is added, a treatise of the nature of arithmetic of logarithms; likewise another of the elements of plain and spherical trigonometry; with a preface, shewing the usefulness and excellency of this work. By Doctor John Keil, 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. Caswel, 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 third edition, carefully revised and corrected, by John Ham, teacher of mathematics in Great Kirby Street, Hatton-Garden. By whom is subjoined an appendix, containing the investigation of those series's omitted by the author. And the difference between Dr. Keil and Mr. Cunn impartially examined and adjusted. .