52 
MR. AIRY ON THE LAWS OF INDIVIDUAL TIDES 
And the heights and ranges are, — 
High Water. 
Low Water. 
Range. 
ft. in. 
ft. 
in. 
ft. 
in. 
15 lOf 
12 
Of 
3 
ql 
12 
oi 
15 10 
11 
31 
4 
as 
12 
CO 
16 10J 
11 
. 12 
0 ! 
u 2 
. 11 
8 
31 
. 11 
oi 
16 3f 
The observations were reduced in exactly the same way as those made at South- 
ampton, with this single difference, that the phase here began from high water (the 
first and last conspicuous phenomenon in these observations having been high water). 
And the values thus found for the converted depression are the following. 
Corresponding phases and converted depressions in the Ipswich tides : the phase 
commencing with high water and increasing by 360° in one tide ; and the depres- 
sion being measured from high water, the whole range being called 2*000. 
Phase. 
Converted 
depression. 
Phase. 
Converted 
depression. 
Phase. 
Converted 
depression. 
Phase. 
Converted 
depression. 
2*5 
0-012 
92-5 
1-197 
182-5 
1-894 
27°2-5 
0-984 
7*5 
0-053 
97*5 
1-276 
187*5 
1-869 
277*5 
0-940 
12-5 
0-120 
102-5 
1-362 
192-5 
1-822 
282-5 
0-891 
17-5 
0-184 
107-5 
1-449 
197*5 
1*779 
287*5 
0-841 
22-5 
0-251 
112-5 
1-527 
202-5 
1-723 
292-5 
0-791 
27*5 
0-322 
117*5 
1-599 
207-5 
1-658 
297*5 
0-736 
32*5 
0-389 
122-5 
1-674 
212-5 
1-586 
302-5 
0-668 
37*5 
0-449 
127-5 
1-731 
217-5 
1-516 
307-5 
0-625 
42-5 
0-513 
132-5 
1-780 
222-5 
1-449 
312-5 
0-564 
47-5 
0-570 
137*5 
1-828 
227*5 
1-381 
317*5 
0-497 
52-5 
0-631 
142-5 
1-874 
232-5 
1-315 
322-5 
0-437 
57-5 
0-689 
147-5 
1-910 
237-5 
1-258 
327-5 
0-367 
62-5 
0-757 
152-5 
1-940 
242-5 
1-211 
332-5 
0-297 
67-5 
0-822 
157*5 
1-964 
247-5 
1*179 
337-5 
0-231 
72-5 
0-890 
162-5 
1-978 
252-5 
1-144 
342-5 
0-168 
77-5 
0-961 
167-5 
1-985 
257'5 
1-107 
347-5 
0-100 
82-5 
1-043 
172-5 
1-974 
262-5 
1-068 
352-5 
0-043 
87*5 
1-117 
177*5 
1-941 
267-5 
1-030 
357*5 
0-011 
By means of these numbers the curve fig. 2 in Plate III. has been constructed. 
To make the phase commence at low water, its numerical value must be diminished 
by about 166°. 
