477 



TABLE 502.— SECULAR CHANGE OF MAGNETIC DECLINATION IN THE 



UNITED STATES 



Smoothed values of the magnetic declination for the indicated places for January 1 of 

 the years stated. The degrees are given in the fourth column, together with the indication 

 E (east) or W (west) ; the minutes are given in the succeeding columns. The pattern 

 depicted by this table for any date is highly smoothed and corresponds with that shown on 

 "datum charts" discussed in current publications of the U. S. Coast and Geodetic Survey, 

 such as those cited.** The latter contain more detailed secular-change tables, as well as 

 current magnetic charts which may be consulted for values reflecting a greater amount of 

 local information than it is possible to show in tabular form. 



SMITHSONIAN PHYSICAL TABLES 



