Tables 573-574. 



TERRESTRIAL MAGNETISM {continued). 



431 



TABLE 573. — Horizontal Intensity. 



This table gives for the epoch January i, 1915, the horizontal intensity, H, expressed in cgs units, corresponding to 

 the longitudes in the heading and the latitudes in the first column. 



TABLE 574. — Secular Change of Horizontal Intensity. 



Values of horizontal intensity, E, in cgs units for the places designated by the latitude and longitude in the first 

 two columns for January i of the years in the heading. 



Smithsonian Tables. 



