110 



THE ROYAL SOCIETY OF CANADA 



order to compare the actual times the A values should be reduced 

 to L.M.T. by adding to ai 17 minutes of time (reduced to degrees at 

 the rate of lhr. to 15°) to a 2 34 minutes, &c, since the Kew values 

 are given for Kew L.M.T. The 24 hour term then has its maximum 

 occur earlier in the day at Kew on the average for the year by about 

 48 minutes, the 12 hour term 25 minutes, the 8 hour term 5 minutes 

 and the 6 hour term at almost the same time. In the case of the 6 

 hour term the maximum at Agincourt as pointed out before occurs 

 much earlier in the summer than in the winter. 



It has long been accepted by magneticians that some relationship 

 exists between magnetism and sun spots, but the nature of that re- 

 lationship has not yet been definitely established. The inequality 

 range, so far as known, is above the mean in years of many sun spots 

 and the excess is conspicuous in years when sun spot frequency is 

 greatest. Table IV Contrasts the Diurnal Inequality Ranges at 

 Agincourt during a period of eleven years from 1902 to 1912, and two 

 years of maximum sun spot frequency 1905 and 1906, and two years 

 of minimum sun spot frequency 1902 and 1912. The mean respective 

 frequencies as given by Prof. Wolfer 1 are 33-7, 58-6 and 4-3. 



Declination Ranges at Agincourt. 

 Table IV. 



Jan. Feb. Mar April May June July Aug. Sept. Oct . Nov Dec 



All years 



Max. spot years 

 Min. spot years 



5-85 

 6-82 

 4-71 



6-07 

 6-32 

 5-34 



8-76 10-09 

 9-82 10-98 

 8-65 9-63 



10-44 10-93 

 10-95 10-54 

 10-73 10-81 



11-51 

 11-54 

 10-83 



13-13 

 13-15 

 12-78 



10-85 

 10-96 

 10-17 



7-51 

 7-44 

 7-40 



6-165-25 

 6-76J5-09 

 5-58 ! 4-60 



Percentage Values. 



All years . 

 Max. spot, years 

 Min. spot years 



The ranges are also given expressed in percentage values of their 

 arithmetic mean, from which we can the better see the effect produced 

 during the maximum sun spot period. 



From the ranges themselves it is noticed that those in maximum 

 spot years are throughout the year larger than in minimum spot 

 years, but that the difference is more marked in winter than in summer, 

 but if we now examine the percentage values we see that the effect 



1 Bulletin Mount Weather Observatory, Vol. 5, Part 6. 



