480 



TABLE 507.— SECULAR CHANGE OF VERTICAL INTENSITY, UNITED STATES 



Smoothed values of vertical intensity in cgs units at the indicated places for January 1 of the 

 years stated. The remarks about smoothing, in Table 502, apply to this table as well. 



TABLE 508.— TOTAL MAGNETIC INTENSITY, UNITED STATES 



This table gives for the epoch January 1, 1950, the smoothed total intensity, F, expressed in 

 cgs units, corresponding to the longitudes west of Greenwich in the heading and the north lati- 

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



TABLE 509.— SECULAR CHANGE OF TOTAL INTENSITY, UNITED STATES 



Smoothed values of total intensity in cgs units at the indicated places for January 1 of the 

 years stated. The remarks about smoothing, in Table 502, apply to this table as well. 



SMITHSONIAN PHYSICAL TABLES 



