396 DR. C. CHREE: ANALYSTS OF RESULTS FROM THE FALMOUTH MAONETO- 



Tables X. and XI. give the values of the coefficients answering to the diurnal 

 inequalities of D and H for the individual months, the three seasons, and the entire 

 year from the whole 12 years' observations. The values of the a and b constants 

 were calculated first, the calculation going a figure further than appears in the 

 tables, and the c and a constants were thence deduced. The phase angles cannot 

 claim an accuracy of 1', especially the monthly values of Og and a 4 ; reasons for 

 recording the minutes are given in (A), 32. 



Table XTI., giving Fourier coefficients for the diurnal inequalities in N and W, is 

 confined to the seasonal and yearly data. 



TABLE XII. Coefficients and Angles in Fourier Series Expansion of Diurnal 

 Inequality of Northern and Western Components. (Unit = ly.) 



The difference between local time at Falmouth and Kew is a little in the way of 

 comparison. But careful study shows that many of the apparently irregular fluctua- 

 tions in the values of a^ and a 4 , which might be ascribed to observational uncertainties, 

 appear to a greater or less extent at both places. For instance, going to the nearest 

 degree, we have the following consecutive values for a 4 in D : 



Whilst amongst the values of a 4 in H we have : 



