MAGAZINE OF SCIENCE AND ART. 
71 
METEOROLOGICAL REPORT. 
Sydney, Month of July, 1857. 
From observations taken at 9 a.m. and 9 p.m t each day . 
a 
§ 
sA 
,_ 3 
Barometer, Reduced, 
etc. 
Temperature of Air. 
Moisture. 
o 
G 
o 
6 
Cloud, 
Winds. 
Remarks 
on 
"Weather, etc. 
a 
d a 
Ci 
c ci 
a ci 
a a 
rt 
% 
Maximum. 
Minimum. 
Greatest 
Range. 
a 
’ o 
£ 
O 
Q 
.5 8 
rt -G 
a 
1—1 
•*» 
G 
CU 
-»-» 
X 
o 
G 
ci 
Cl 
S 
a 
u 
o 
£ 
Gene ral 
Direction 
I 
29-529 
52-8 
60-1 
46-6 
13-5 
39-2 
•00 
5 
5 
Ci. 
w sw 
1 Fine and clear 
2 
29-969 
44-7 
610 
38-3 
22-7 
3-85 
•00 
6 
0 
Cu.-St. 
sw. s 
) Fresh drv breezes 
3 
30 037 
47-6 
57-5 
30-2 
27-3 
41*5 
•00 
5 
1 
Oi.-St. 
SW. N 
Ice of .1 inch thick 
4 
29-811 
57-1 
66-8 
50-2 
166 
43-5 
•00 
7 
5 
Cu. St. 
WNW 
1 Strong dry breeze 
SS 
29-738 
55*4 
63-4 
38-3 
25-1 
43-6 
•00 
5 
6 
Cu. St. 
WSW 
1 
6 
29-953 
50-4 
63-3 
37-6 
257 
417 
00 
6 
1 
Cu.-St. 
SSW 
Fall cumuli 
7 
30073 
45-3 
61-4 
35-7 
257 
407 
■00 
7 
4 
Ci.Cu.Ci.St 
SW 
Varied clouds 
8 
30-195 
490 
60-6 
38-0 
22-G 
43-2 
•00 
7 
7 
Cu. 
s 
Threatening clouds 
9 
30-331 
44-2 
59-2 
38-8 
20-4 
40-9 
.00 
7 
0 
s 
Quite clear 
10 
30-345 
44-4 
C4-1 
35-5 
28-6 
41-8 
•00 
6 
2 
Cu. 
WSW. NNE 
Change of wind 
11 
30-315 
45-5 
58-6 
37-8 
20-8 
447 
•00 
5 
4 
Ci-St. 
Calm 
'i 
12S 
30*333 
53-3 
61-8 
40-4 
21-4 
47.9 
■00 
6 
5 
Ci-St. Cu. 
NNE 
13 
30-276 
49-5 
61-4 
39-4 
220 
4-79 
•oo 
G 
1 
Ci-.Cu 
Calm 
14 
30-221 
49-6 
643 
39-6 
247 
48-2 
•09 
4 
1 
Cu.-St. 
Calm 
Night mists & dews 
15 
30-150 
52-0 
63-5 
41-3 
22*2 
50-2 
•16 
6 
9 
Ni. Ci-St. 
NNW 
Rain and thunder 
16 
30-110 
51*4 
61-1 
45-0 
16-1 
45*5 
•00 
6 
0 
Cu.-St. 
SW 
?ine 
17 
30-143 
54-5 
61 3 
453 
16-0 
44-6 
•00 
7 
10 
Cu. 
s 
1 T1 i 
18 
30*280 
52-6 
61-6 
50-7 
10-9 
474 
•00 
8 
5 
Cu- 
'S 
19S 
30289 
473 
63-5 
41-1 
22-4 
45-4 
•00 
6 
4 
Cu. Ci.-St 
w 
20 
30-232 
48-9 
61-8 
41-9 
19-9 
48-0 
•00 
5 
8 
Cu, Ci.Cu. 
Calm 
Gloomy 
21 
30-183 
50-9 
645 
40-3 
24-2 
50-0 
‘00 
4 
0 
Cu,-St. 
SSE 
Fine 
22 
30-199 
52-0 
621 
434 
1S-7 
49-4 
•09 
8 
4 
Cu. 
SSE 
Shower 
23 
30-192 
50-7 
62-8 
48-0 
19-8 
50-3 
.12 
8 
3 
Cu. 
SE 
Heavy dews & mists 
24 
30-149 
53-3 
63-8 
47-0 
16-8 
50-7 
‘00 
7 
1 
Cu. 
SW. S 
Fine and clear 
25 
30-105 
49-3 
640 
40-3 
23-7 
47-3 
•00 
6 
7 
Ci.-St. 
SW. SE 
Red sunset 
26S 
30.079 
53-4 
60-7 
46 4 
14-3 
52-9 
•06 
9 
10 
Ni. 
Calm. SE 
Black gloomy clouds 
27 
29-966 
55-2 
57-9 
52-5 
5-4 
540 
3-27 
10 
10 
Ni. 
E. ENE 
[ Floods of rain and 
28 
30062 
55-8 
68-1 
51-5 
6-6 
49-6 
1 ‘67 
7 
10 
Cu. Ci.-St. 
SE 
j high gales 
29 
30-115 
54-6 
620 
53-8 
8-2 
48-2 
‘09 
8 
5 
Cu. 
SE 
Showers 
30 
29-973 
46‘2 
60-3 
41-5 
18-8 
45-4 
•10 
7 
5 
Cu. 
W 
Clearing up 
31 
29-820 
55-2 
68-2 
40-4 
27-8 
43-8 
■00 
6 
0 
w 
Fine and dry 
30-103 
50-7 
620 
42-3 
197 
46-0 
5‘56 
6‘4 
4-2 
Means and 
sums. 
30-381 
57*7 I 
68-2 
30-2 
38-0 
54-1 
10 
10 
Highest ) of single readings 
29-451 
38-1 
36-7 
0 
Lowest J at 9 a,m. or 9 p.m. 
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 -930 inch The 
mean gaseous pressure of dry air is 29’792 inches. 
Temperature of Air y —The mean of all self-registered 
maxima and minima is 52-1 degrees. 
The adopted mean temperature of the month from 
all observations is, therefore, 5 Id degrees Fahren¬ 
heit. The adopted mean of the month for the last two 
years is 47.9 or 3£ degrees lower. 
Moisture .—The dew-point is calculated from readings of 
Negretti’sand Larnbra's dry and wet bulb thermome¬ 
ters, by the use of GIaisher*s tables. 2nd Edn, 
The mean temperature of evaporation at 9 a.m. and 
9 p.m., is 48*4 degrees. The mean elastic force of 
vapour is 311 inches. The average proportional 
humidity of the air is denoted by §5, perfectly dry 
air being taken as 0, and saturated damp air as 100." 
Rain .—More or less rain fell on S days during the 
month. The total depth is 5-56 inches; of which 
4*94 inches, or nine-tenths, fell in about 36 hours. 
The rain is collected at one foot above the ground, 
and measured at 9 p.m. 
Cloud .—The extent of cloud is expressed by the tenths of 
the whole sky covered by it 
The forms of clouds are denoted as follows, the num¬ 
ber of days on which each kind occurred during 
the month being added in figures. 
Cu. Cumulus 15 Ci-Cu. Cirro-cumulus. ... 3 
Ci. Cirrus.1 Ci.-St. Cirro-stratus . 8 
St. Stratus.2 Cu -St. Cumulo-stratus ... 5 
Ni. Nimbus,,..3. 
Winds .—The winds may be thus summed up. 
NNW 
i 
day j 
! SSE 
2 day 
W N W 
l 
*1 < 
; SE 
4 
West 
31 
>» ! 
East 
1 .. 
WSW 
U 
! ENE 
1 .. 
S W 
41 
NNE 
U „ 
SSW 
1 
,, j 
North 
1 » 
South 
5 
” * 
Calm 
41 „ 
W. S. JEV0NS. 
Double Bay, near Sydney, N.S.W. 
Errata in Table, page 45, of Lost (July) number of 
Magazine:—6th column, for 51T, read 5*0'6; for 69*1, 
read 69*4. 7th colnmn, for 1*8 read 2*8; for 1*0, read 
4. In last line, for two years read two pairs. In page 
*46, June 17th, for E E read N E. 
