112 TABLES 91-92. 



TERRESTRIAL MAGNETISM (continued). 



TABLE 91. Dip or Inclination. 



This table gives for the epoch January i, 1905, the values of the magnetic dip, I, corresponding 

 to the longitudes west of Greenwich in the heading and the north latitudes in the first column. 



TABLE 92. -Secular Change of Dip. 



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

 Greenwich in the first two columns for January ist of the years in the heading. The degrees 

 are given in the third column and minutes in the succeeding columns. 



SMITHSONIAN TABLES. 



