CONTENTS.

BOOK I.
THE PRE-TELESCOPIC AGE.
CHAP. PAGE
I.—The Dawn of Stargazing[1]
II.—The First Instruments[16]
III.—Hipparchus and Ptolemy[25]
IV.—Tycho Brahe[37]
BOOK II.
THE TELESCOPE.
V.—The Refraction of Light[55]
VI.—The Refractor[73]
VII.—The Reflection of Light[90]
VIII.—The Reflector[100]
IX.—Eyepieces[109]
X.—Production of Lenses and Specula[117]
XI.—The “Optick Tube”[139]
XII.—The Modern Telescope[152]
BOOK III.
TIME AND SPACE MEASURERS.
XIII.—The Clock and Chronometer[175]
XIV.—Circle Reading[211]
XV.—The Micrometer[218]
BOOK IV.
MODERN MERIDIONAL OBSERVATIONS.
XVI.—The Transit Circle[233]
XVII.—The Transit Clock and Chronograph[253]
XVIII.—“Greenwich Time,” and the Use Made of It[271]
XIX.—Other Instruments Used in Astronomy of Precision[284]
BOOK V.
THE EQUATORIAL.
XX.—Various Methods of Mounting Large Telescopes[293]
XXI.—The Adjustments of the Equatorial[328]
XXII.—The Equatorial Observatory[337]
XXIII.—The Siderostat[343]
XXIV.—The Ordinary Work of the Equatorial[349]
BOOK VI.
ASTRONOMICAL PHYSICS.
XXV.—The General Field of Physical Inquiry[371]
XXVI.—Determination of the Light and Heat of the Stars[377]
XXVII.—The Chemistry of the Stars: Construction of the Spectroscope[386]
XXVIII.—The Chemistry of the Stars (continued): Principles of Spectrum Analysis[401]
XXIX.—The Chemistry of the Stars (continued): The Telespectroscope[422]
XXX.—The Telepolariscope[441]
XXXI.—Celestial Photography.—The Ways and Means[454]
XXXII.—Celestial Photography (continued): Some Results[463]
XXXIII.—Celestial Photography (continued): Recent Results[469]