Chapter II: Preface: vii

CHAP.

I. THE EVOLUTION OF THE TELESCOPE 1

II. THE MODERN TELESCOPE 31

III. OPTICAL GLASS AND ITS WORKING 57

IV. THE PROPERTIES OF OBJECTIVES AND MIRRORS 76

V. MOUNTINGS 98

VI. EYE-PIECES 134

VII. HAND TELESCOPES AND BINOCULARS 150

VIII. ACCESSORIES 165

IX. THE TESTING AND CARE OF TELESCOPES 201

X. SETTING UP AND HOUSING THE TELESCOPE 228

XI. SEEING AND MAGNIFICATION 253

APPENDIX 279

INDEX 281

THE TELESCOPE