Carnegie Inst. Washington Pub. 289, Vol. Ill— Douglass 





Months 

 II 



593 v 







tt*» 





B 



A. Cyclograms of Abbott's radiation curve, December 1918-July 1930. 1, Direc- 

 tional values at 11 months. 2, Analysis at 11 months. 3, Analysis at 8 months. 



B. Cyclograms of magnetic character figure C, analvzed for 27.0-day period. 

 1, Jan. 21, 1923- Jan. 26, 1926; 2, Jan. 26, 1926-Oct. 29, 1928"; 3, Oct. 18, 1928-Dec. 15, 

 1931; 4, Dec. 15, 1931-Nov. 9, 1933. 



Five stronger horizontal rows indicate a 27.0-day period; intermediate rows show 

 maxima in reversed phase, that is, in opposite longitudes; rows of maxima pointing down 

 to the right indicate periods more than 27.0 days; rows pointing up to the right, less than 

 27.0 days. 



C. Cycle relief map of the magnetic character figure C January 1932 to March 

 1935. It is made of separate cards cut to contours of 3-day means, slightly smoothed; 

 each card has 81 days of data progressing upward in the photograph and beginning on 

 each card 27.0 days later than the card to its left. Note the conspicuous horizontal 

 alignments and the alternating levels of the 6-months maxima. 



