336 
EEV. S. H AUGHT ON ON THE TIDES OF THE 
that Table. When this correction is made we find the following Spring 
Ranges : — 
ft. in. 
Springs. — 19th September, 1.30 a.m. ...... 5 8 
5th October, 1.28 p.m . 5 8| 
Neaps . — 27th September, 7.0 a.m. 14 
and Neap 
Using the formula for the Semidiurnal Tide, 
we fin'd at Springs 
and at Neaps 
from which we obtain 
T=M' cos 2 (m-iJ+S' cos 2 (s-i s ), 
T=A cos 2 (m— B), 
(M'+S')= 34T inches, 
(M 7 — S') = 8 inches; 
2 M'=42T inches, 
2 S' =26-1 
S^_ 
M'“ 
0-621. 
( 7 ) 
C. Semidiurnal Tide (Intervals). 
When Table II. is plotted to scale, and the Tide corrected for the Diurnal Inequality, 
we obtain the following results, making use of the formulae given in discussing the 
Tide at Northumberland Sound : — 
Maximum Value of 2 B. 
Range of Lunitidal Interval at High Water. 
h m 
29th September, 10.25 a.m +16 
9th October, 4.50 p.m —1 24 
2 B=2 30 
Range of Lunitidal Interval at Low Water. 
h m 
25th September, 10.20 a.m +6 48 
28th September, 3.30 p.m +4 59 
2B=1 49 
The approximate value of i m , taken from the mean of the observations, is, 
h m 
At High Water —0 27 
Low Water •— 0 11 
