THE ECLIPSE CYCLONE AND THE DIURNAL 



CYCLONES. 



Results of Meteorological Observations in the Solar Eclipse of 



Mat 28, 1900. 



By II. Helm Clayton. 



Presented November 14, 1900. Received December 12, 1900. 



The path of total solar eclipse in the United States on May 28, 1900, 

 was visited by a number of experts and trained observers, who took 

 meteorological observations as a part of the program on the day of the 

 eclipse. These included Mr. A. Lawrence Rotch and Mr. S. P. Fer- 

 gusson at Washington, Ga. ; Mr. O. B. Cole at Centerville, Va. ; Mr. G. W. 

 Pickard at Virginia Beach, Va. ; and myself at Wadesboro, N. C. These 

 observations were sent to the Blue Hill Meteorological Observatory and 

 given to me for discussion. Besides these I obtained records from a 

 number of well-equipped observatories in North America. These in- 

 cluded the Toronto Observatory, the New York Central Park Observa- 

 tory, the Blue Hill Observatory, the Belen College Observatory of 

 Havana, the McGill College Observatory of Montreal, the Meteorological 

 Station at Cornell University, the City Engineer's Office at Providence, 

 R. I., and observations by Mr. Eddy at Bayonne, N. J. These obser- 

 vations were all within the area of partial eclipse, and the data were 

 furnished by the kindness of the directors. 



The details of the discussion of the observations are published in a 

 Bulletin of the Blue Hill Meteorological Observatory.* The results 

 embody certain conclusions of general interest which I am permitted to 

 present to the Academy. 



The meteorological changes due to the eclipse were separated from 

 other changes of greater length, such as the diurnal and cyclonic, by 

 interpolating a uniform change between the beginning and the end of the 

 eclipse and subtracting this from the observations. For example, in 

 Figure 1 is plotted the observations of temperature at Wadesboro, N. C. 



* Annals of the Astron. Observatory of Harvard College, XLIII. No. 1. 



