591 



Tables 740 and 741 



TABLE 740.— Dip or Inclination, United States 



This table gives for the epoch January i, 1925, the values of the magnetic dip, I, cor- 

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

 the first column. 



TABLE 741.— Secular Change of Dip, United States 



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

 west of Greenwich in the first two columns for January 1, of the years in the heading. The 

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



Smithsonian Tables 



