vi CONTENTS. 



Page 



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

 Conclusion that the Variations of the Horizontal Component are independent of 



the temperature of the soil and atmosphere, xlvi 



Determinations of the Coefficient, xlvi 



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



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



Coefficient Constant for High and Low Temperatures, xlvii 



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



temperature of the soil and atmosphere, xlviii 



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



Inclinometer — 



Description of the Instrument, 1 



Observations for the determination of Instrimiental Errors, li 



Method of determining the Absolute Vertical Component and Inclination (fooUiote) li 



Barometer — 



Description of the Instrument, lii 



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



Corrections applied to the Observations, liii 



Thermometers — 



Description and Position of the Dry and Wet Bulb Thermometers, liii 



Scale Errors, Iv 



Maximum and Minimum Thermometers, Ivi 



Actinometer — 



Description of the Instrument, Ivi 



Method of Observation, Ivii 



Effect of Plate-Glass Cover, Ivii 



Rain-G auges — 



Description and Positions of the Gauges, Iviii 



Vanes and Anemom,eter — 



Position of the Vanes, Iviii 



Description of the Anemometer, lix 



Mode of Observation, Ix 



State of the Sky — 



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



Symbols used for the amount of Sunshine and Rain, Ixi 



Clock, dc. — 



State of the Clock in the Magnetic Observatory, &c., Ixi 



Description of the Tables of the Observations, Ixi 



Reference to the Abstracts of Results, Ixiv 



Account of the Curves projected by the Anastatic Process, Ixiv 



Addendum — 



Results of Observations for the Absolute Horizontal Intensity, made with large bars, Ixv 



Observations for Induction and Temperature Coefficients of small bars, Ixvi 



Results of Observations for the Absolute Horizontal Intensity, made with small bars, Ixix 



