Magnetical Observations — 



CONTENTS. Ill 



Page 



Hourly Observations of Magnetometers, 1 



Term-Day Observations of Magnetometers, 71 



Extra Observations of Magnetometers, 91 



Observation of Magnetic Dip, - 161 



Observations for the Absolute Horizontal Intensity, 165 



Meteorological Observations — 



Hourly Meteorological Observations, 171 



Daily Meteorological Observations, 310 



Temperature of Water in Pump-Wells, 311 



Observations of the Actinometer, • 313 



Meteorological Notes on Shooting Stars, Tbunder-Storms, &c, 320 



Abstracts of the Results of the Magnetical Observations — 



Results for the Magnetic Declination, 329 



Mean Declination and Secular Change, 330 



Annual Period, 331 



Differences of the Daily Means from the Monthly Means, 332 



Variations with reference to the Positions of the Moon, 333 



Diurnal Ranges, Annual Variation, 334 



Diurnal Ranges with reference to the Positions of the Moon, 336 



Diurnal Variation of Magnetic Declination, 337 



Ranges of Mean Diurnal Variation, 341 



Variation with reference to the Moon's Hour-Angle, 342 



Intermittent Disturbances ; effect on the Yearly Mean Declination, 343 



Intermittent Disturbances ; effect on tbe Monthly Mean Declination, 343 



Intermittent Disturbances ; effect on the Hourly Means of Declination, 343 



Mean Difference of a Single Observation from the Monthly Mean ; Annual 



Variation, 346 



Mean Difference of a Single Observation from the Monthly Mean with reference 



to the Position of the Moon, 347 



Mean Difference of a Single Observation from the Monthly Mean ; Diurnal 



Variation, 347 



Number of Positive Differences ; Annual Variation, 349 



Number of Positive Differences ; Diurnal Variation, 349 



Mean Disturbance ; Annual Variation, 349 



Diurnal Variation of the Positive and Negative Sums of Disturbance, 350 



Diurnal Variation of tbe Positive and Negative Means of Disturbance, 350 



Number of Positive Disturbances; Annual Variation, ■ ••••• 350 



Number of Positive Disturbances ; Diurnal Variation, 350 



Probable Disturbance, 351 



Probable Disturbance ; Annual Variation, 352 



Probable Disturbance ; Diurnal Variation, • 352 



Note on the Diurnal Variation of Magnetic Declination, 354 



