312 On the Tides of Key West. 
diurnal inequality in height, corrected for parallax, and the third 
the same, as uncorrected for parallax. 






TABLE No. 7%. 
Diurnal inequality height ; Diurnal inequality height; 
Moon’s age. observation—theor - Moon’s age. observation—theory. 
Corrected. Uncorrected. | Corrected. Uncorrected. 
H. M. aM. nen ee ee 
0 30 005 010 6 30 —080 — 085 
1 30 005 005 7 380 —090 —090 
2 30 — 035 —030 8 8 — 065 — 06 
3 30 —035 —035 9 39 —020 — 020 
4 30 —075 — 080 10 80 —030 —030 
30 — 070 —070 |. 11 80 +005 019 








The residuals are very small, but follow the law of the half- 
monthly inequality, as was found, also, from the corresponding 
results of the Cat Island observations. 
The discussion of the value of E, which is in progress, I hope 
to present at a future meeting of the Association. we 
; Changes of mean level. j 
The mean level of the water at Key West was seen from the 
observations to undergo remarkable changes from one period 
the year to another. A comparison of the reductions for the first 
and second six months shows that the high water of neap tides 
of the first period rises actually to a higher level than the high 
water of spring tides of the second. ‘The mean level of the 
high water for the first six months exceeds that for the second 
by 0-48 foot. The form of the half-monthly inequality 18 pet 
fectly regular in each six months. The guage had remal 
undisturbed ; and in seeking for the explanation, it was observ 
that the mean level of the water varied very materially 10 the 
two periods, there being a change which appeared to go throug 
its variations in the course of the year. 7 
e annexed table shows the heights of high water at the 
several ages of the moon in the first and second six months, tf 
ferred to the same zero. 




TABLE No. 8. 
Moon’s age. Height of high water. 
First six months. Second six months. _ 
0 30 6°63 6-05 
1 30 "59 “04 
3 30 “38 5-97 
4 30 31 
5 30 ‘26 45 
6 30 17 72, 
7 30 28 42 
8 30 “26 “19 
9 3 "34 -90 
10 30 “48 - 601 P 
11 30° “pA ni, sateen & 
6°39 edie 591 




