no 



TABLE 90. 

 TERRESTRIAL MAGNETISM. 



Secular Change of Declination. 



Changes in the magnetic declination between 1810, the date of the earliest available observa- 

 tions, and 1910, for one or more places in each state and territory. 



* Tables have been compiled from United States Magnetic Tables and Magnetic Charts for 1905, published by 

 the Coast and Geodetic Survey in 1908. 

 SMITHSONIAN TABLES. 



