MAGNETIC DISTUEBANCES AT KEW. 



283 



reduction in number was thus not without its disadvantages. By having, however, 

 independent results from a smaller number of more highly disturbed days, one was 

 able to arrive at a clearer idea of the relationship between the absolute range and the 

 range of the diurnal inequality. 



The object of obtaining results confined to the years of sunspot maximum was to 

 see whether disturbed days showed any parallel to the great enhancement of the 

 regular diurnal inequality on quiet and ordinary days at sunspot maximum. The 

 four years 1892 to 1895 contributed 33 disturbed days to winter, 28 to equinox, and 

 20 to summer. The mean value of the absolute range for these days, it will be 

 noticed, was considerably in excess of the mean from the whole 11 years, a fact that 

 should be borne in mind when considering the corresponding diurnal inequalities. 



TABLE VI. Diurnal Inequality of Horizontal Force (Unit O'ly). 



Hour 



Forenoon. 



January . 

 February . 

 March . . 

 April . . 

 May . . 

 June . . 

 July 



August . 

 September 

 October . 

 November 

 December 



2 o 2 



