AT KEW OBSERVATORY, 1898 TO 1912. 153 



TABLE VI. Diurnal Inequality 1905 to 1912. Amplitudes and Phase Angles. 





adding +19' to a l5 +38' to a a , and so on. 19' represents the equivalent of the 

 difference between Kew and Greenwich solar time, viz., about 1-j- minutes. 



In the corresponding Tableau E, (Table V., p. 311) the phase angles, it should be 

 noticed, refer to G.M.T. 



The monthly values of c, and <? 3 from Table V. are expressed in Table VII., first in 

 terms of their own arithmetic means, and secondly in terms of the corresponding mean 

 monthly potential gradient. The former results are shown graphically in the two 

 lowest curves of fig. 4. The last column of Table VII. expresses Cj as a fraction of c a . 



TABLE VII. Diurnal Inequality. Amplitude Ratios. 



VOL. CCXV. A. 



