f 88 Table 737 (continued) 



MEAN ANNUAL VALUES OF MAGNETIC ELEMENTS AT OBSERVATORIES 



00 Means, 6 months, July to December, pp Means, 8 months, May to December. 11 The D values from 1912 

 to be decreased by 5/.1 for comparison with values in previous years; in igi4an earth inductor replaced the dip 

 circle on another pier and values are referred to dip-circle pier. "Trouble experienced with galvanometer; 

 earth inductor replaced by dip circle in 1928; the values of / and Z for 1927 are indicated as only approximate. 

 83 No data in June, and only 4 days in May and 7 days in July. " No data in January. uu Superseded about 

 1913 by Vassouras. 



Smithsonian T*3les 



