XCVlll 
Geneeal Results or the Makeestoun Obseevations. 
Table 93. — Number of Observation Hours in 24 at which (within 10™) the Wind blew with a force of 
0-1 lb. or upwards, for each Month in the Years 1843-6. 
Year. 
Jan. 
Feb. 
^larch. 
April. 
May. 
June. 
July. 
Aug. 
Sept. 
Oct. 
jSTov. 
Dec. 
Mean. 
1843 
18-0 
16-2 
11-6 
12-9 
15-3 
17-7 
14-7 
9-3 
10-2 
15-5 
12-4 
16-8 
14-2 
1844 
8-6 
12-3 
14-7 
14-3 
10-2 
16-0 
11-3 
16-1 
17-7 
17-0 
17-7 
6-8 
13-6 
1845 
14-4 
18-7 
20-3 
16-2 
20-7 
18-3 
17-8 
18-2 
15-8 
2M 
15-2 
19-6 
18-0 
1846 
15-9 
16-8 
14-6 
17-2 
19-5 
15-7 
21-0 
17-8 
17-5 
18.8 
17-7 
17-7 
17-5 
Mean 
14-2 
16-0 
15-3 
15-1 
16-4 
16-9 
16-2 
15-3 
15-3 
18-1 
15-7 
15-2 
15.8 
203. Annual Variation of the Number of Observation Hours at which the Wind was observed to blow 
luith a force of O'l lb. or upwards. — Four years' observations are evidently insufficient to shew this annual 
variation free from irregularity. The wind blew dui'ing the greatest number of hours in October and in June, 
and it blew during the least number of hours in January. See Table 93. 
Table 94. — Mean Pressure of the Wind while blowing, for each Month in the Years 1843-6. 
Year. 
Jan. 
Feb. 
March. 
April. 
May. 
June. 
July. 
Aug. 
Sept. 
Oct. 
jS'ov. 
Dec. 
j Mean. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
\ lb. 
1843 
1-66 
1-27 
0-65 
0-89 
0-62 
0-55 
0-56 
0-45 
0-38 
0-58 
0-92 
1-00 
! 0-79 
1844 
0-96 
0-73 
0-85 
0-69 
0-46 
0-75 
0-33 
0-56 
0-46 
0-80 
0-86 
0-33 
0-65 
1845 
0-76 
0-66 
0-95 
0-91 
0-77 
0-73 
0-53 
0-50 
0-43 
0-72 
0-80 
1-19 
0-75 
1846 
0-70 
0-67 
0-99 
0-48 
0-67 
0-56 
0-56 
0-26 
0-25 
0-55 
0-63 
0-49 
0-57 
Mean 
1-02 
0-84 
0-86 
0-74 
0-65 
0-65 
0-50 
0-44 
0-38 
0-66 
0-80 
0-75 
0-69 
204. Annual Variation of the Mean Pressure of the Wind luhile blowing. — We have in No. 199 consi- 
dered the annual variation of the mean pressure of the wind with reference to time, the sums of the observed 
pressures being divided by the whole number of observations ; in the present case the sums of the observed 
pressures are divided only by the number of observations for whicli the Avind was blowing : thus, in Xovember 
1843, the wind was observed blowing at little more than half the whole number of observation hours : conse- 
quently the mean pressure with i-eference to the whole number of observations for that mouth (Table 90) is 
only a half of the mean pressure with which the wind was observed blowing (Table 94). The law is the 
same for both means, but it is better marked in the present case than in that of No. 199. The ivind blows luith 
the greatest force in Jariuari/, and with the least force in September, 
205. Diurnal Variation of the Number of Observation Hours at tuhich the Wind ivas observed blotving. 
— The following are the mean numbers of times, at wliich the ^^■ind was observed bloAviug 0*1 lb. or upwards, 
in the four years 1843-6 : — 
12^ ll'A.M. 2'' 3l> 4l> O'l ell 7h 10'» 11'' 0'> ll" p.m. 2^ 5^ 7^ 9^ 10»> ll"" 
150 156 155 164 162 163 176 190 214 224 242 251 262 266 266 238 249 240 225 211 186 169 162 160 
The wind blew most frequently at 1'' 40™ p.m., tlic epoch of maximum temperature ; it blew seldomest about 
1"' A.M. 
206. Diurnal Variation of the Mean Pressure of the Wind while blotuing (see No. 204). The following 
arc the means for each liour, as deduced from the observations for the four years 1843-6 : — 
I'JIi ll'A.M, 2'' 31' f>l' Cl' 7^ 81' 9I' 10'' Ul' Ol' ll' r.M. ^1' 3I' 4'' 5*" 6^ 7'' S'' 9'' U1l> 11'' 
lb. lb, lb. lb. lb. lb. lb. lb. lb. lb. lb. lb. lb. lb. lb. lb. lb. lb. lb. lb. lb. lb. lb. lb. 
0-67 0-67 0-65 0'60 0-70 0-71 0-67 0-64 070 0-77 0-78 0-SO 0'7S O'SO O'SO 0-75 0'70 0 67 O-Gl O'oS 0-61 0-65 0-67 0'69 
