386 DR. C. CHUKK: ANALYSIS OF R?>5(TLTS FKOM TIIK FALMOKTH MACNKTO 



at 7 or 8 P.M. The slight apparent tendency in the hours of maxima and minima to 

 be later than at Kew is again ascribahle to the difference in local time. 



As at Kew, the range seems nearly stationary from May to August, the sum of the 

 differences from May to July. In every month of the year the range and the sum of 

 the differences, especially the latter, are larger than at Kew. Judging by the 

 common period 1892 to 1895, the range in the mean diurnal inequality for the year 

 at Falmouth is the greater by some 13 per cent. 



Northerly and Westerly Components. 



9. The diurnal inequality in N is similar to that in H, but a second maximum and 

 minimum in the morning are generally recognisable even in summer. The chief 

 minimum, near noon, and the afternoon maximum occur somewhat later than in H. 

 The range and the sum of the differences show more clearly than in H a secondary 

 minimum at midsummer ; from October to March they are both decidedly larger than 

 in H, but at midsummer the difference is, if anything, the other way. 



The general character of the diurnal inequality in W resembles that in D. The 

 afternoon maximum and the forenoon minimum the only pronounced turning points 

 during the seven months, March to September seem slightly later than in D. The 

 mean diurnal inequality for the year presents a very slow rate of change from 1 A.M. 

 to 3 A.M., but only one maximum and minimum are shown. In the amplitude of the 

 range there is at least a suggestion of two maxima in summer, with an intervening 

 minimum, but the sum of the differences shows only a single maximum in June. 



The range in W is distinctly larger than in N in the mean diurnal inequality for 

 the year, and in every month except November, December and January, but the sum 

 of the differences is larger in N than in W during 7 months of the 12, and in the 

 mean diurnal inequality for the year. 



10. For purposes of comparison of different elements at different stations, the 

 annual variation in the ranges and in the sum of the differences is most conveniently 

 exhibited by representing the 12 monthly values as percentages of their arithmetic 

 mean. This is done in Table IX. The small figures in the D and H columns give 

 the excess of the Falmouth percentages over the corresponding Kew percentages in 

 Table XVIII. of (A). 



The range and the sum of the differences vary pretty similarly, but the principal 

 maximum is higher for the 24 differences than for the ranges, especially in W. 



There is not much difference between the different elements, but the midsummer 

 values are decidedly higher and the midwinter values decidedly lower in W than in 

 N, i.e., the annual variation is greater for the former element than the latter. The 

 Falmouth percentages are, on the whole, distinctly above the Kew in winter and 

 below them in sunmier, the difference being greater in H than in D. This means 

 that annual variation is less marked at Falmouth than at Kew. 



