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
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