TABLE OF CONTENTS. 



Page 



A. Introduction 1 



B. Declination 7 



The Needles • 1 



Asimnfh 8 



The Observations 9 



C. Horizontal Intensity 27 



Determination of the Constants 28 



Detormination of the Temperature Coefficient 28 



Determination of the Constants C and /i 29 



The Temperature of the Magnets 34 



The Observations 36 



Observations of Deflection 36 



Observations of Vibration 50 



Summary of the Results 63 



D. Inclination 69 



The Index-error 70 



The Observations 72 



E. General Results 79 



