Altazimuth Department, 205, _et seq._ American time, 153 Andromeda nebula, 301 Anemometer, use of, 238; trace of, 242 Angström, 268 Anson, Commodore, 17 Apparent time, 152 Arcturus, motion of, 315 Argelander, star catalogue of, 287 _Art of Dialling_, the, 28 Assistants, position of the, 98, 100, 117, 137 Astrographic chart, 128 ---- Department, 284, _et seq._ ---- dome, 128 ---- telescope, 289, _et seq._ Astronomers Royal, the, 25 Astrophysical researches, 282 Auroræ, 281 Automatic register, 241 Axis of the earth, precession of, 184 Ball, Time, 162 Barometer, use of the, 192, 233 Battery basement, 161 Beaufort, Captain, 107 Bessel quoted, 266 Betelgeuse, 184 Birkenhead, wreck of the, 180 Bliss, Nathaniel, fourth Astronomer Royal, history of, 82 Bradley, James, third Astronomer Royal, his life, 73; his ordination, 74; Vicar of Bridstow, 74; Savilian Professor of Astronomy, 75; discovers Aberration of Light, 75, _et seq._; becomes Astronomer Royal, 79; labours of, 80; character of, 81 Bradley's transit room, 128 Brinkley, Dr., 303 _British Mariner's Guide_, the, 90 Bunsen, 268 Buys Ballot's law, 237 Canadian time, 153 Castor, 74, 306 Catalogues, star, 182, 185, _et seq._, 198, 284 Cepheus, 183 Charles II., warrants of, 39, 40 Christie, W. H. M., eighth Astronomer Royal, work of, 120 Chromosphere of the sun, 268 Chronograph, the, 157 ---- room, 126 Chronometer business, 101, 107 Chronometers, Harrison's improvements in, 165, _et seq._; tests of, 169; 'runs' of, 173; romance of, 178 Circle Department, 181, _et seq._ Clock, Astrographic driving, 290; driving 28-inch telescope, 312 Clocks, standard, 160 Columbus, aim of voyage of, 18 Comet, appearance of a, 28 ---- Wells, 280 Comets, observation of, 224; spectra of, 280 Commutator, the, 162 Comte, assertion of, 267 Constant of Aberration, 79 Cook, Captain, work of, 170 Copper, use of in Observatory, 245 Corona of the sun, 264 Crabtree, James, 31 Crosthwait, Joseph, 57 Dallmeyer telescope, 252 Declination, 186, _et seq._ Denebola, 184 Distances of planets, 223; of sun, 224 Double-Star Department, 303, _et seq._ Double Stars, 306 Dublin time, 155 Dunkin, Edwin, 315 Earth, the, movements of, 201 Eclipses of the moon, 216; of the sun, July 25, 1748...85; other eclipses of the sun, 263, _et seq._ Electric Railway, influence of, 249 Equation of Time, the, 29, 151 Equatorial, Shuckburgh's, 101 ----, the great 28-inch, 221 ----, the Merz, 12-3/4-inch, 114 ----, 28-inch, driving clock of, 309; use of, 313 ----, clock-driven, 74 Eros, discovery of, 223; photographs of, 298 Errors in observations, noting of, 199, _et seq._ Evaporation, 241 Faculæ of the sun, 257