MAGNETIC SURVEY OF JAPAN FOR THE EPOCH 189Ö.0. 3o 



r,= 2° 48:50 -3:90j;.+ 11:03 j^- -o:380( J/.y- + o: ll4(J/)(JvO-o:i3.Xj^)- 



+ .44 ±.14 ±.14 ±.04:3 ±.083 ±.041 



ti=r)r 23:.3S- 8:41 J/+ <^'):7GJv^-o:oo:h J/0' --<"''iGO(j;o( Jç^)-o:r.7-2(Jv-)- 



±.65 ±.20 ±.21 ±.064 ±.122 ±.060 



H = 29069: 4 - 49!72 j; - 404: 60Jçf- 141 G(J?.f + 6:544( J/)( 4^) - 5: 680(4^)- 

 ±2.0 ±0.62 ±0.64 ±0.194 ±0..''>74 ±0.184 



where j;. = (;.-138°)° and, J^=(^-37°)° expressed in degrees. 



The values calculated from these expressions are compared with 

 the given data in Table VI., 



TABLE VI. 



MagiKitic Elements calculated as Quadratic Functions of Longitud(^ 

 Latitude, from the Data given hy Splierical Harmonics for 1885.0. 



and 



