14. Mr William Galbraith on the Tides and Dew- Point. 
DATE. Greenwich High 
Time. water. 
H. M. Feet. 
Aug. 18,| 6°55 p.m. | 440 
14,| 740 a.m. | 5°40 
14, 2°0 P.M. 
14,; 815 pm. | 5°50 
15,| 9°30 a.m. | 5°50 
15,| 3°40 p.m. 
16,| 10°30 a.m. | 5:40 
17,| 11°45 a.m. | 5°40 
17,| 5:15 pm. 
18,| 11°50 a.m. | 5°50 
18,| 5°55 p.m. 
20,| 7°10 a.m. 
20,| 1°20 p.m. | 5°40 
20,| 7:30 em. 
21,| 7°50 a.m. 
21,| 2°10 p.m. | 5°50 
21,| 8°20 p.m. 
The method of reduction is as follows :— 
Feet. 
First high water, 6°40 
Second high water, 5°67 
Sum, 12°07 
Half Sum, 6°03 
Intermediate low water, 12°60 
Sum, 18°63 
Half sum, = SY 
Barom. cor. for 30°2in., 0°22 
Mean tide, 9°54 
Inches. 
Barometer, ‘ 3 e0:20 
Standard, 30°00 
Difference, +0°20 
Hence by formula (2.),+1°1 
x 0°2=0°22 foot, the cor- 
rection for the barometer, 
as stated above. 
Low | Baro- |Thermo- Weather 
water. | meter. | meter. i : 
Feet. | Inches. 3 
29°05 | 62 F. |Fresh Breeze. 
29-50 | 62... Do. 
2 : Very fresh 
12:80 | 29-40 | 62 .. { pines 
29°60 | 61.. Do. 
29-70 | 60 ... Do. 
12°80 | 29°80 | 61 ... Do. 
29°60 | 60 ... Do. 
30:10 | 61 ... | Moderate. 
13°60 | 30°10 | 60 ... Do. 
SO 20 uous Do. 
13°80 | 30°20 | 60 ... Do. 
14°20 | 30°30 | 61 ... Do. 
30°30 | 62 ... Do. 
14:05 | 30°30 | 61 ... Do. 
14°40 | 30°00 | 64 ... Do. 
30°32 | 64 ... Do. 
14:00 | 30°30 | 65 ... Do. 
Feet. 
or, First low water, 12°60 
Second low water, 12°80 
Sum, : : . 25°40 
Half Sum, + 21270 
Intermediate high water, 5:67 
Sum, 18°37 
Half sum, ‘ ; 9:18 
Barometric cor. 0°22 
Mean tide, 9°40 
Thermometer about 60°. 
It is hardly necessary to correct 
the barometer for this tempe- 
rature, except in cases of great 
accuracy, when the observations 
are made with the best appara- 
tus. 
