22 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 



which would carry it from pole to Equator in one period of oscilla- 

 tion. This is evidently a law which applies to wavelike changes of 

 all lengths. 



Fig. 14.— Wave front showing speed of movement in a 7-day wave. 

 In Dr. Weickmann's ' able analysis of the 24-day wave of pres- 



sure 



of the winter of 1923-24, it is shown that the wave originated 



' Petermanns Mitteilungen, Ergiinzungsheft No. 191, 1927. 



