228 MR. LUBBOCK ON THE METEOROLOGICAL OBSERVATIONS 
a mathematician, I must confess that this cause does not appear to me ade- 
quate to produce any sensible effect ; for in the open sea the variations of the 
height of the water due to the tides, where this cause would be most felt, do 
not exceed three or four feet, and any considerable rise of the tide is in general 
confined within very narrow limits, as in channels and between the banks of 
rivers. Lastly, I have endeavoured to ascertain how far the barometer is 
affected by the direction of the wind ; and the following Table gives the results 
which I have obtained with this view. The fluctuation due to this is much 
greater than that due to any other cause ; and it is therefore very important 
that this correction should be carefully ascertained, in order that it may be 
applied when observations of the barometer are classed, in order to determine 
any other inequality. The barometer is lowest, as might be expected, in the 
rainy quarters, as S.W. and W.S.W. 
Table showing results deduced from the Meteorological Observations made 
at Somerset House during the years 1827, 1828, and 1829, classed 
according to the direction of the Wind. 
Direction 
of the 
Wind at 
9 A.M. 
No. of 
Obser- 
vations. 
9 o’clock A.M. 
3 o’clock p.m. 
Dew point 
at 9 a.m. 
in degrees 
of Faiir. 
Rain in 
inches, 
read off 
at 9 a.m. 
Barometer. 
Attach. 
Therm. 
Barometer. 
Attach. 
Therm. 
N 
117 
30.009 
47.4 
30.014 
49.3 
41 
.019 
NNE 
88 
30.068 
52.2 
30.043 
54.0 
45 
.032 
NE 
35 
29-923 
49.3 
29.912 
51.1 
42 
ENE 
16 
30.005 
49.4 
29.941 
52.8 
45 
.100 
E 
74 
29.915 
53.2 
29-889 
55.8 
47 
.021 
ESE 
68 
29-951 
52.5 
29.916 
54.2 
45 
.022 
SE 
30 
29-793 
57.8 
29.772 
59.2 
52 
.053 
SSE 
39 
29-742 
55.8 
29.680 
57.9 
51 
.052 
S 
73 
29-808 
54.4 
29.795 
56.4 
49 
.033 
SSW 
88 
29-815 
56.7 
29-782 
58.5 
51 
.038 
SW 
103 
29-884 
54.8 
29-8.35 
56.6 
48 
.069 
wsw 
143 
29.900 
54.5 
29.898 
56.7 
48 
.059 
w 
83 
29.944 
57.0 
29.936 
59.1 
49 
.059 
WNW 
18 
29.889 
57-2 
29- 887 
60.0 
50 
.053 
NW 
65 
29.936 
55.6 
29-802 
57.4 
46 
.054 
NNW 
56 
29.978 
54.8 
30.014 
56.8 
46 
.080 
Mean of Total 
29-918 
54.7 
29.893 
55.7 
47 
.044 
