AECTIC SEAS.— PAET IY. NOETHUMBEELAND SOUND. 
A is the apparent height of the tide, and 
B is the apparent Lunitidal Interval at High Water and Low Water. 
At Spring-Tides we have 
rn-s=i m -i s , | .... ( 6 ) 
A=M'+S';f 
at Neap-Tides we have 
m—s—i m —i s = 90°, } ( 7 ) 
A=M'— S'J 
The maximum Spring-Tides occurred: — 
Sun’s Hour- Angle. 
Moon’s Hour-Angle. 
h m 
h. m 
6 th June . 
. 12 50 A.M. 
+ 1 18 
12 15 p.m. 
+ 0 21 
19th June 
. Midnight. 
+ 1 6 
20th „ . . 
. 11 20 A.M. 
+0 2 
Mean 
. 0 6 ' 
+0~42 
minimum Neap-Tides occurred: — 
Sun’s Hour- Angle. 
Moon’s Hour- Angle. 
h m 
h. m 
30th May . . 
. . 6 40 A.M. 
-0 15 
7 0 p.m. 
-0 19 
12th June 
..40 A.M. 
-0 30 
3 15 p.m. 
-1 40 
Mean . 
. +5~14 
-0~26 
From the Spring-Tides we find, by equation ( 6 ), 
i m —i s = 36 m ; 
and from the Neap-Tides, by equation (7), we obtain 
The mean of these values gives us 
i m —i= 38 m ( 8 ) 
We have no means of determining i m and i s separately. 
The maximum and minimum ranges of the Tide, corrected for Diurnal Inequality only, 
were : — 
Springs. Eange. 
6 th June 19*3 inches. 
20th June 23-7 „ 
Mean . . 21-5 
