Page ERRATA. 13 3rd Compartment, Lalande 11158, Feb. 19, Seconds of Mean R.A., for 1521 read 115 3rd " 15.28. Lalande 11158, Mean Seconds of Mean R.A., for 1511 read 158.13. B.A.C. 1924, Feb. 19, Seconds of Mean R.A., for 29543 read 29$ 47. B.A.C. 1957, Feb. 19, Seconds of Mean R.A., for 9o32 read 99.38. W.B. (2) VI. 72, Feb. 19, Seconds of Mean R.A., for 28.04 read 2797. * N.P.D. 50° 1′, Jan. 5, Seconds of Mean R.A., for 29502 read 285.98. Lalande 11823, Mar. 7, Seconds of Mean R.A., for 29.05 read 28$.93. B.A.C. 3671, Day of Observation, for March 16 read April 16. 82 Leonis, Day of Observation, for March 25 read April 25. 39 Ophiuchi, Name of Star, for 2nd star read 1st star. Name of Star, for W.B. (2) XVII. 1388 read W.B. (2) XVII. 1386, 7. W.B. (2) XVII. 1515, Seconds of Mean R.A., for 105.72 read W.B. (2) XVIII. 985, Day of Observation, for Aug. 9 read Name of Star, for W.B. (2) XX. 1301 read W.B. (2) XX. 1302. Groombridge 1852, Seconds of Mean N.P.D. (R), for 25"19 read 23" 61. 2534 (1st star), the observation of Aug. 17 belongs to the Second Star. W.B. (2) XX. 1225, Mean N.P.D., for 66° 47′ 44′′-69 read 66° 46′ 44′′ 52. Name of Star, for W.B. (2) XX. 1301 read W.B. (2) XX. 1302. 135 After the constants for W.B. (2) XX. 1301, insert those for No. 1302, thus: REDUCTION OF THE OBSERVATIONS OF R.A., MADE WITH THE TRANSIT CIRCLE Reduction from Apparent to Mean R.A. of Stars Duration of Transit of the Semidiameters of the Sun, Moon, and Mercury Duration of Transit of the Semidiameter of Venus REDUCTION OF THE OBSERVATIONS OF ZENITH DISTANCE Value of the Screw of the Telescope Declination-Micrometer Flexure of the Telescope Errors of the Divisions of the Circle . Page i i & ii ii ii ii ii iii iii iii iii iii & iv iv iv & v v & vi vi vi vii & viii ix ix to xiii xiii xiv to xvi xvi xvii xvii xvii xvii xvii xvii xviii SEPARATE RESULTS FOR MEAN R. A. AND MEAN N.P.D. OF STARS OBSERVED IN 1874 Separate Results for Mean R.A. Constants for Unknown Stars observed in 1874 Notes to the Observations Separate Results for Mean N.P.D. Table of the Differences between the Reflexion-Results and Direct-Results for XXV XXV XXV XXV xxvi xxvi to xxx xxxi xxxi to xxxv CATALOGUE OF CONCLUDED MEAN R.A'S AND MEAN N.P.D'S FOR 1874, HORIZONTAL AND VERTICAL DIAMETERS, AND R. A. AND N. P. D., OF THE SUN, MOON, AND PLANETS xli Error of the Tabular Value of the Duration of Transit of the Sun's xli Error of the Tabular Value of the Sun's Vertical Diameter xli Error of the Tabular Value of the Duration of Transit of the Moon's xli Error of the Tabular Value of the Moon's Vertical Diameter xli Computation of Mean Solar Time. xli Observed and Tabular R.A. and N.P.D. of the Sun, Moon, and Planets MEASURES OF DISTANCE AND ANGLE OF POSITION OF THE COMPONENTS OF DOUBLE STARS, AND OF THE DIAMETERS OF JUPITER AND URANUS. Description of the Heliometer, where found. xlii xlii TABLE OF CONTENTS. Diameter and Focal Length of its Object-Glass Means provided for giving motion to the segments of the Object-Glass Illumination of its Scale Page xlii xlii xliii The Position Circle, Declination Circle, and Hour Circle . xliii xliii xliii & xliv xliv Determination of the Zero of the Position Circle. xliv xliv MEASURES OF DOUBLE STARS. Method of Observation Value of the Scale Table of Values of the Zero of the Position Circle CATALOGUE OF DISTANCES AND ANGLES OF POSITION OF THE DOUBLE STARS OBSERVED IN 1874 Stars chosen for Observation Results of the Measures of the Diameters of Jupiter OBSERVATIONS OF COGGIA'S COMET, MADE WITH THE HELIOMETER . Distances for Computation of Refraction and Parallax, whence derived Assumed Mean R.A. and N.P.D. of the Comparison-stars for 1874, Jan. 1. OCCULTATIONS OF STARS BY THE MOON; AND PHENOMENA OF JUPITER'S SATELLITES Computation of Lunar Elements for the time of Observation xlv xlv xlv xlv xlv xlv xlvi xlvi Formula for direct computation of the Parallax in Hour Angle and N.P.D. xlvi & xlvii Notes to the Observations made with the Transit Circle in 1874 137 Horizontal and Vertical Diameters, and R.A. and N.P.D., of the Sun, Moon, Measures of Distance and Angle of Position of the Components of Double Stars, Results of the Measures of the Diameters of Jupiter Observations of Shooting Stars in 1876. RADCLIFFE OBSERVATIONS, 1874. 247 259 a* TABLE OF CONTENTS. INTRODUCTION TO THE METEOROLOGICAL OBSERVATIONS OF 1874 The Meteorological Observer, and his duties. Page [ii] [ii] Comparison of the Barographic Results, reduced according to the assumed Scale, [iv] Comparison of Results of Thermograph and Hygrograph with the Readings of the Standard Dry and Wet Thermometers . Situation of the Thermograph and Hygrograph. [vi] & [vii] [vii] [vii] [vii] [vii] [vii] RESULTS FOR THE DIRECTION AND VELOCITY OF THE WIND; AMOUNT of Method of deducing the Mean Two-Hourly Direction and Velocity of the [ix] [ix] [ix] & [x] [x] •[x] & [xi] |