A TREATISE ON SPHERICS, COMPRISING THE ELEMENTS OF Spherical Geometry, AND Of PLANE and SPHERICAL Trigonometry, TOGETHER WITH A SERIES OF TRIGONOMETRICAL TABLES. By D. CRESSWELL, M. A. FELLOW OF TRINITY COLLEGE, CAMBRIDGE. CAMBRIDGE: Printed by J. Smith, Printer to the University; PUBLISHED BY J. MAWMAN, No. 39, LUDGATE STREET; CONTENTS. Page On the Mutual Contact of Circles in a Sphere...........................102 On the Comparison of Spherical Surfaces with one another.........141 |