262 SUPPLEMENT TO THE HONGKONG GOVT GAZETTE OF 28TH MAR., 1885.
The annual variation of the height of the barometer is due to the seasonal heating and cooling the interior of Asia, which causes also the monsoons. This is clearly exhibited in the following tab the first column of which shews the mean height of the barometer at the Observatory reduced to 32 and to mean sea level. The second column shews the mean excess of the barometer in Shanghai Hongkong, the distance between these stations being about 670 miles. The third column shews the mean excess of the barometer in Hongkong over Manila, the distance being about 600 miles. T data in the two last columns have been derived from the telegraphic reperts for 10a. :--
1884
January,
30.211
+ 0.092
+0.149
February,..
30.181
0.107
0.124
March,
30.027
0.081
0.043
April,
29.985
0.047
+0.016
May,
29.866
0.022
-0.016
June,
29.775
0.032
0.096
July,
29.694
0.029
0.074
August,
29.738
0.010
0.087
September,
29.798
0.081
-0.048
October,
30.034
0.084
+0.117
November,
30.113
0.138
0.203
December,
30.238
+0.114
+0.260
Year,
29.972
+0.070
+ 0.049
The monthly range of the barometer has been computed from the 10a. and 4p. telegraphic reports (taking the mean of the two results) received from different stations the latitudes of which are as follows:-
Manila 14° 36', Amoy 24° 27′, Shanghai 31° 15′, Nagasaki 32° 45′, Wladivostock 43° 7′.
Year. 1884
Month.
February, March,
>>
"
>>
"
>>
"
>"
1885
April, May, June, July, August, September, October, November, December,
January,
MONTHLY BAROMETRIC RANGE.
Manila.
Amoy. Shanghai,
Nagasaki, Mladivostock,
.170
.435
.475
.720
.915
.195
.400
.560
.650
.895.
.180
.430
.530
.630
.820
.170
.320
.425
.595
.905
.185
.290
.365
.495
.600
.365
.510
.325
.415
.765
.475
455
.355
.800
445
.280
.470
.380
.370
.490
.175
.310
.495
.410
.785
.500
.365
.470
.480
.610
.245
.285
.465
.540
.685
.185
.315
.395
.455
.710
In the north, where storms prevail during the winter, the range is greatest at that season. In the south it is greatest during the summer, the typhoon season.
The barometric range and the average force of the wind have been computed in a similar manner from registers received from other stations. Observations made during November and December 1884, and January 1885, were used and the results are exhibited in the following table :---
Monthly Average
Station.
Barometric Force
Station,
Monthly Barometric
Average
Force
Range. of Wind.
Range.
of Wind,
Manila,
Kiungchow,..
0.21
1.3
Foochow,
0.35
1.4
.25
2.5
Ningpo,
.39
1.7
Pakhoi,
.28
3.2
Kinkiang,
.42
2.5
Steep Island, Lh.,
.42
4.9
Canton,
.27
2.3
•
Shaweishan, Lh.,
.39
3.5
Takau,
.26
3.8
Gutzlaff. Lh.,
.40
3.9
Anping,
.22
•
Fisher Island, Lh.,
North Saddle, Lh.,
.45
4.6
.23
3.9
Wuhu,
.43
1.5
Breaker Point, Lh.,
.25
4.1
Chinkiang,
.60
2.3
Lamocks, Lh.,......
.21
4.5
Swatow,
Ichang,
.51
.27
1.6
Chefoo,
.58
2.6
Ocksen, L.,
Amoy,
Turnabout, Lh.,'
Middle Dog, Lh.,
.21
.23
.30
ོ॰ ུ
1.7
Shantung Prom., Lh.,
.52
4.8
5.2
Taku,
.58
4.8
4.2
Wladivostock,.
.67
2.3