4.^0 



TABLES 571 572. 



TERRESTRIAL MAGNETISM (continued). 

 TABLE 571. Dip or Inclination. 



This table gives for the epoch January i, 1915. the values of the magnetic dip, /, corresponding to the longitudes 

 Greenwich in the heading and the north latitudes in the first column. 



TABLE 572. Secular Change of Dip. 



Values of the magnetic dip for places designated by the north latitudes and longitudes west of Greenwich in the 

 first two columns for January i of the years in the heading. The degrees are given in the third column and the minutes 

 in the suceeding columns. 



SMITHSONIAN TABLES. 



