Title: A treatise on spherical trigonometry, by W.J. M'Clelland and T. Preston
Description: Book digitized by Google from the library of Oxford University and uploaded to the Internet Archive by user tpb.
Subjects: sin, tan, cos, circle, triangle, spherical, circles, points, sides, cot, great circle, small circle, middle points, spherical triangle, angular distances, arcs joining, great circles, opposite sides, arc joining, diametrically opposite