MAGNETIC DISTURBANCES AT KEW. 



293 



As might have been anticipated, the largest ratio in Table X. is for the quiet day 

 D results ; and there is a substantial reduction in passing even to the ordinary days. 

 The most remarkable feature of the table is the large size of the ratio in the case of 

 V. The winter values for this element actually exceed the winter value for D on 

 ordinary days. Another important result is the large size of the value for H in 

 summer. 



Comparing the results obtained for V from all disturbed days, from 10 days a 

 month, and from sunspot maximum years, we see that the inequality range increases 

 in all cases with the absolute range, and is roughly proportional to it. 



17. In comparing diurnal inequalities attention is often directed almost entirely 

 to the amplitude of the range. This gives, however, rather a one-sided view. The 

 value of a particular element may differ very little from the mean throughout the 

 greater part of the 24 hours, the changes to and from the mean being practically all 

 concentrated in a few hours. A second element may pass rapidly from a value near 

 the maximum to a value near the minimum and conversely, retaining throughout the 

 greater part of the 24 hours values remote from the mean. The curves representing 



TABLE XI. Values of (Average Departure -r Diurnal Inequality Range). 





