Contents. 



Paok. 



§ 1. Object of the Survey ] 



{; 2. Division of Work in Eacli Year 1> 



^ ;>. Equipment and Procedure of Eacli I'arty 4 



§ 4. Instruments 7 



'i Ô. Method of Observation 11 



^ 6. Diurnal Variation 21 



§ 7. Eeduction to 1895.0 22 



^ 8. Reduction to tlie tSea Level ;jO 



^ 9. Isoniagnetics ;;ü 



2 10. Mean Isoniagnetics ol 



^ 11. Vertical Cin-rent 122 



I 12. Vertical Variation of Magnetic Elements 120 



^ 13. Disturbance in the Vertical Variations of Magnetic Elements 141 



§ 14. Disturbing Magnetic Forces 17Ö 



Tables. 



Page. 



Table 1. Correction to be applied to tlie Estimated Fractions of Second when 



Simple Harmonic Motion is Observed by Eye and Ear ]MctIiod. ... 12 



Taele II. Annual Variation of Declination 24-25 



Table III. „ „ „ Dip 26-27 



Table IV, „ „ „ Horizontal Intensity 28-29 



Tabi,!'; V. Magnetic Elements Calculated fr< m X, Y, Z, expressed in Spherical 



Harmonics fur 1885.0 by Prof. Ad. Schmidt o2 



Table VI. Magnetic Elements in the Neighbourhood of Japan calculated as 

 (iuadratic Functions of Longitude and Latitude, from the Data 

 given by Spherical Ilannonics for 1885.0 ?>o 



Table Vll. Declinations at 1895.0. at tiie Intersections of Entire Degrees of 



Longitude and Latitude o8-ö9 



