( 180 ) 
These three equations are satisfied by the values: 
W=111.17cM., S=270eM., C—= 207°8' 
Substituting these values in equations (1), we find, on putting: 
Y=S, sin Cs, X== Sg cos Cy 
(1) ee ea he 12.731 cM. 
(2) —0.5 X + 0.866 Y = 10.801 ,, 
(3) 24 = 1.634 ,, 
(4) 5 X + 0.866 Y= 12.731 „ 
(5) 5 X-+ 0.866 Y = 10.802 ,, 
(6) x — 1.636 ,, 
and from these 
(1) + (2) + (4) + (5) = 3.464 Y = 47.065; Y= 13.587 eM. 
Substituting this value of Y in (1) (2), (4) and (5) we find: 
X = 1.930 eM. 
and in (3) and (6) 
© = 1,684 eM. 
The difference is small, but it points to a systematic error, e. g 
in the assumption that the diurnal variation may be represented by 
only two periodic terms instead of by three or more, owing to the 
somewhat aperiodic description of the influence of land- and seabreezes. 
As a final value we take: 
1.930 X 4 + 1.634 X 2 
KES 5 = 1.832 cM. 
S,=13.71 eM. Cy = 82°20'. 
d. With a view of calculating the constants of the tides K, and 
P the following sums and differences of the monthly means are used. 
a b c 
(8)4+(10) HE) WHO) ab ae 
April 210.1 212.6 215.6 — 2.5 ae 
May 155.8 218.2 231 — 62.4 —81.7 
June 184.5 247.9 269.4 —63.4 —84.9 
July 198.8 263.6 283.9 — 64.8 = peel 
August 220.2 290.9 294.8 — 70.7 — 14.6 
