ON THE LAWS OF RISE AND FALL OF THE SURFACE. 
261 
Tables of the Elevation or Depression of the Surface of the Sea above or below Mean 
Water at all hours of the Tide. 
For Plymouth. 
Before or after 
High Water. 
Spring Tides. 
Octant Tides. 
Neap Tides. 
C h m 
0 0 
1000 
825 
600 
<D 
0 30 
97 9 
797 
584 
£ 
1 0 
872 
721 
530 
rt *< 
I 30 
720 
599 
441 
2 0 
522 
432 
330 
> 
2 30 
289 
245 
194 
< 
_ 3 0 
041 
038 
047 
f 3 30 
217 
172 
100 
4 0 
462 
367 
243 
4 30 
665 
541 
371 
C3 
5 0 
834 
679 
470 
5 30 
945 
772 
550 
_ 6 0 
996 
818 
592 
Low water. . 
1000 
825 
600 
Time 
h m 
6 8 
h m 
6 11 
h m 
6 20 
At 2 h 52 m before and after high water, the surface, both at neaps and springs, is 
57 of the parts above mean water, that is -^th of the tidal unit. 
For Liverpool. 
Before or after 
High Water. 
Spring Tides. 
Octant Tides. 
Neap Tides. 
, h m 
0 0 
1000 
775 
429 
0 30 
979 
748 
417 
£ 
1 0 
872 
677 
379 
a 
CJ ^ 
1 30 
720 
562 
315 
g 
2 0 
522 
405 
236 
> 
© 
2 30 
289 
230 
139 
L 3 0 
041 
635 
033 
f 3 30 
217 
1 6 1 
071 
=L 
4 0 
462 
344 
174 
4 30 
665 
508 
265 
5 0 
834 
637 
336 
5 30 
945 
725 
393 
L 6 0 
996 
768 
423 
Low water. . 
1000 
775 
429 
Time 
h m 
6 9 
h m 
6 11 
h m 
6 19 
