11 CONTENTS. 



Tlie Temperature Coefficients of the Deflecting, Balance, and Bifilar Magnets — 



Temperature Coefficient of the Deflection Magnet, xlv 



Coefficient Constant for High and Low Temperatures, xl vi 



Temperature Coefficient of the Bifilar Magnet by hot-water experiments, xlvi 



Coefficient Constant for High and Low Temperatures, xlvi 



Method of determining the Coefficient by the comparisons of the usual observations, xlvii 

 Conclusion that the Variations of the Horizontal Component are independent of 



the temperature of the soil and atmosphere, xlviii 



Determinations of the Coefficient, xlviii 



Error of the determinations by hot and cold water experiments, xlix 



Temperature Coefficient of the Balance Magnet by hot-water experiments, xlix 



Coefficient Constant for High and Low Temperatures, xlix 



Conclusion that the Variations of the Vertical Component are independent of the 



temperature of the soil and atmosphere, 1 



Determinations of the Coefficient by comparisons of the usual observations, li 



Inclinometer — 



Description of the Instrument, lii 



Insufficiency of the Observations, liii 



Improved method of determining the Absolute Vertical Component and Inclination, liii 



Barometer — 



Description of the Instrument, liv 



Indirect Comparisons with the Standard of the Royal Society of London, liv 



Corrections applied to the Observations, lv 



Thermometers — 



Description and Position of the Dry and Wet Bidb Thermometers, lv 



Scale Errors, lvii 



Maximum and Minimum Thermometers, lviii 



Actinometer — 



Description of the first Instrument, I viii 



Description of the second Instrument, lix 



Rain- Gauges — 



Description and Positions of the Gauges, lx 



Vanes and Anemometer — 



Position of the Vanes, Lx 



Description of the Anemometer, lxi 



Mode of Observation, lxii 



State of the Shj — 



Mode of estimating the Extent of Sky Clouded, and the Motions of Clouds, lxii 



Symbols used for the amount of Sunshine and Rain, lxiii 



Clock — 



State of the Clock in the Magnetic Observatory, Lxiii 



Description of the Tables of the Observations, lxiii 



Reference to the Abstracts of Results, Lxvi 



Account of the Curves projected by the Anastatic Process, lxvi 



