TABLE 499.— COORDINATES OF SOUTH MAGNETIC POLE 



471 



* For authorities, see bibliography, p. 501. 



t Based on the above position for 1912.5 with reduction for secular change. 



TABLE 500.— DIP OR INCLINATION, UNITED STATES 



This table gives for the epoch January 1, 1950, smoothed values of the magnetic dip, /, cor- 

 responding to the longitudes, X, west of Greenwich in the heading and the north latitudes, *, in 

 the first column. The remarks about smoothing, in Table 502, apply to this table as well. 



TABLE 501.— SECULAR CHANGE OF DIP, UNITED STATES 



Smoothed values of the magnetic dip for the indicated places for January 1 of the years stated. 

 The degrees are given in the third column and in the succeeding column. The remarks about 

 smoothing, in Table 502, apply to this table as well. 



SMITHSONIAN PHYSICAL TABLES 



