Abstract
THE author of this book, who is one of the naval instructors on H.M.S. Britannia, has brought together the most important rules which are used in the solution of spherical triangles, and, after demonstrating the theory of each, introduces worked-out exercises for illustrating their actual use. The arrangement of the text seems to be well done, the student being led first to understand the geometrical relations between circles of a sphere, their spherical triangles, and after that the geometrical relations between the sides and angles of spherical triangles. Chapter iv. introduces for the first time the trigonometrical ratios, and this is followed by chapters in which the solutions of various types of triangles are dealt with. Throughout these the author makes the solution of the various problems very clear to the student by means of the figures which accompany the text, but the reader is nowhere directly advised to always construct figures for himself.
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