20 
MAGAZINE OF SCIENCE AND ART. 
METEOROLOGICAL REPORT. 
Sydney, Month of Mat, 1857. 
From observations taken at 9 a.m. and 9 p.m w each day. 
rt 
30 
ri* 
Sd 
Barometer Reduced, 
etc. 
Temperature of Air. 
Moisture. 
Ci.om, 
O 
0 
O 
o 
Winds. 
Remarks 
on 
Weather, etc. 
ri* c 
C5 V, 
OO 
a 
J “ 
<* 
Maximum. 
Minimum. 
Greatest 
Range. 
Dew point. 
Rain. 
Inches. 
c 
o 
y, 
Q 
0 
rt 
o 
Form. 
Gene ral 
Direction 
l 
30-00G 
56*5 
GS-l 
449 
232 
4.3-4 
•00 
0 
5 
IV. S. IV. 
Clear and pleasant 
2 
30010 
511 
08-9 
388 
301 
45-8 
•Of) 
1 
Ci-St. 
0 
IV. S. IV. 
Lunar halo 
3 S 
29-905 
50-8 
03-8 
43-8 
20-0 
430 
•00 
4 
NL 
5 
HHK. IVSIV. 
Squall 
4 
30136 
60-9 
03-8 
374 
264 
41-7 
•00 
0 
6 
IV. s. 
5 
30-252 
49-0 
08-7 
40-7 
280 
43-7 
•00 
0 
5 
IV. S. 
Yerv clear air, and 
c 
30-172 
50-2 
00-8 
39-2 
270 
450 
•00 
5 
Ci-St. 
4 
IV. 
fine weather. 
t 
30-257 
530 
02-8 
390 
23-8 
44 1 
•00 
0 
Cu. 
siv. s. 
8 
80-308 
49-2 
02-8 
42-0 
20-2 
43-2 
■00 
1 
G 
SIV. SSE 
9 
30-230 
50-0 
04-8 
37-3 
27-5 
433 
.00 
1 
Cu. 
IV. s. 
10 S 
30-302 
49-1 
50-8 
44-9 
11-9 
47-4 
1-97 
10 
Hi, 
9 
S. S. E 
Rain and hail 
11 
30-217 
60-2 
02-3 
451 
17-2 
47-7 
•34 
8 
Hi. 
8 
S. S. E. 
12 
30-103 
59-7 
650 
54-9 
10-7 
510 
•31 
7 
Hi. Cu. 
9 
S. E. 
13 
30-220 
57-3 
63S 
480 
15*2 
53-7 
•02 
7 
Cu. Ci. 
S. E. 
14 
30-204 
58-8 
09-2 
40-9 
22-3 
53 *5 
•00 
5 
"'i-St. Cu. 
4 
E. 
15 
33-320 
GO-8 
62-4 
53-2 
9-2 
4S-7 
•00 
10 
?i-St. Cu. 
8 
S. S. E. 
"Hose cion’s 
16 
30-375 
54-4 
03-5 
51 6 
n-9 
61*5 
•03 
10 
Ji-St Cu. 
8 
S. S. E. 
strong winds 
ITS 
30-417 
59-G 
050 
50-1 
14-9 
51 9 
*65 
9 
Hi. 
8 
S. E. 
leavv showers 
18 
30-405 
020 
66-0 
55-3 
10-7 
48-0 
•05 
6 
Cu. 
•p 
‘ S.E. 
Yesli breezes 
19 
30-378 
59-4 
66-4 
55-2 
11-2 
50-6 
•28 
5 
Cu. Hi. 
9 
S.E. S 
bowery weather 
20 
30-285 
Gl-9 
67-3 
565 
10-8 
50-4 
-oc 
9 
Cu. Hi. 
E. S. E. 
Tall cumuli and 
21 
30 072 
55-3 
018 
52-9 
89 
531 
‘21 
9 
Ni. 
9 
ESE- S. 
heavy showers 
22 
29-840 
50-8 
620 
405 
101 
48“ 
•03 
9 
C'u. Hi. 
5 
N.H.E ’ 
hunderstOrm 
23 
29 854 
44.5 
55-4 
41-9 
13 5 
38-1 
•12 
5 
Ci. Cu. 
9 
IV. 
Tiky clearinoj 
248 
29-927 
50-3 
58-2 
34-1 
241 
44-1 
1‘00 
9 
St. Cu. 
8 
S. S. IV. 
l oar-frost. Squall v 
25 
30-090 
51-1 
02-1 
439 
182 
41-4 
■02 
0 
8 
N. IV. 
20 
30.193 
50-0 
03-8 
42-0 
21-8 
424 
■00 
0 
Cu. 
0 
S. W. 
27 
30-387 
49-0 
02-8 
39-8 
230 
43-9 
•00 
0 
7 
S. IV. 
28 
30-491 
47-G 
054 
38-4 
27-0 
450 
‘00 
1 
Cu. 
5 
S.IV. S.E, 
29 
30-400 
51'5 
04-4 
3S9 
25-5 
50-0 
'00 
5 
Cu. 
3 
S. IV. 
Night mists 
30 
33375 
52‘6 
63-8 
42-7 
21-1 
49-0 
•00 
6 
Ci-St. Cu. 
4 
s. 
Various clouds 
31S 
30-345 
55-7 
051 
400 
18-5 
510 
‘00 
9 
Hi. 
8 
X. E. 
Large dark clouds. 
30-215 
53-9 
64-0 
450 
19-0 
47-2 
5‘74 
4‘9 
6‘7 
Mean 
s land sums. 
30-501 
63-5 
03-2 
35-1 
50-8 
10 
10 
Highest ) 
of single readings 
29-796 
43-2 
34-1 
35-8 
0 
0 
Lowest j 
at 9 a,m. or 9 p.in. 
N,B.—The observations are not corrected for diurnal 
variation. The principal instruments have been com¬ 
pared at Greenwich, and the readings are all reduced 
accordingly. 
Pressure ,—The barometer is 11 feet above the sea-level. 
The greatest range of pressure is ’705 inch The 
mean gaseous pressure of dry air is 29*889 inches. 
Temperature of A fr,—The mean of all self-registered 
maxima and minima is 545 degrees. 
The adopted mean temperature of the month from 
all observations is, therefore, 54 2 degrees Fahren¬ 
heit. The adopted mean of May, 1850, was 54 9 deg. 
Moisture .—The dew-point is calculated from Negretti's 
dry and wet bulb thermometers, by the use of 
Glaisher’s tables. 
The adopted mean temperature of evaporation is 
50*7 degrees. The mean elastic force of vapour is 
*326 inches. The average proportional humidity of 
the air is denoted by 77, perfectly dry air being 
taken as 0, and saturated damp air as 100. 
Raw .—The total depth fallen is 5 74 inches; it is col¬ 
lected at one foot above the earth and measured 
at 9 p.in. 
Cloud .—The extent of cloud is expressed by the tenths of 
the whole sky covered by it. 
The forms of clouds are thus denoted : 
Cu. 
Cumulus. 
Ci.-Cu. 
Cirro-cumulus 
Ci. 
Cirrus. 
Ci-St. 
Cirro-stratus. 
St. 
Stratus. 
Cu-St. 
Cumulo-stratus. 
Ni. Nimbus, i. 
e. rain or storm cloud. 
Ozone .—The mean monthly amount of ozone is : by day 
C‘9 degrees, by night 6'5 ditto. 
Winds .—The winds may be thus summed up. 
N.W., 1 3 ; W.S.W., 2£ ; S.W.. 4 * : S.S.W-, 
1; SS.E.,44; S.E., 5J; E.S.E., 1J; E. 1; 
N.E.. 1 • N.N.E., 2 days 
The prevalence of S.E. winds was remarkable. 
W. S. JEVOXS. 
Double Bay, near Sydney, N.S.W. 
