SUPPLEMENT TO THE HONGKONG GOVT GAZETTE OF 25TH JULY, 1885. 651
Table III exhibits the hourly readings of the Temperature of Evaporation (Damp Bulb Thermo- eter) as measured from the Thermograms (at two minutes past the hour named) and also the Solar Radiation Maximum (Black Bulb) and Terrestrial Radiation Minimum Temperatures.
Table IV exhibits the Mean Relative Humidity in percentage of saturation (the humidity of air turated with moisture being 100) and Mean Tension of Aqueous Vapour present in the air expressed
inches of
mercury, for every hour in the day and for every day in the month. The Mean Tension, hich exhibits a daily variation, was 0.490. The Mean Relative Humidity, which also exhibits a isily variation, was 67.
Table V exhibits the Duration of Sun-shine as registered by aid of the Sun-shine Recorder from Lalf an hour before to half an hour after the hour named. The Sun shone 177.1 hours during the
.onth.
Table VI exhibits the amount of Rain registered from half an hour before to half an hour after the hour named. The Total Rain-fall during the month was 1.495 inches. It rained during 33 hours. The greatest Hourly Rain-fall was 0.210 at 1 p. on the 3rd.
Table VII exhibits, for every hour in the day, the Velocity of the Wind and its Direction in numbers (8-E, 16-S, 24-W, 32-N) as measured from the Anemograms. The Velocity is the number of miles traversed by the Wind, from half an hour before to half an hour after the hour named. The Direction is read off at the hour, except when the Wind is very light and changeable, when the average Direction during the hour is estimated, taking into account the Velocity from different quarters. The Direction is not noted when the Velocity is below 1.5 miles an hour.
The Mean Velocity was 15.8 miles an hour. It was greatest during the middle of the day. The greatest Velocity, 49 miles, occurred at 2 a. on the 22nd.
The Total Distance travelled by, as well as the Duration and average Velocity of Winds from Jifferent quarters were as follows:-
Direction.
N
NE
E.
SE
S
SW
W
NW Calm
Total Distance.
Duration.
Velocity.
Miles.
Hours.
Miles per hour.
3290
208
15.8
1601
121
13.2
6063
321
18.9
230
27
8.5
33
8
4.1
2
3.5
66
14
4.7
GL
7
8.7
8
12
0.7
Table VIII exhibits, for every hour in the day, the Velocity of the Wind reduced to 4 and also to 2 Directions, as well as the Mean Direction of the Wind, which exhibits a small daily variation.
Table IX exhibits the Direction (to two points) and Force of the Wind (0-12) at Victoria Peak. The Average Force of the Wind was 4.2 corresponding to 24 miles an hour. The Sea Disturbance
9-9) exhibited in the same table has been derived from observations made at Cape d'Aguilar.
Table X exhibits the Amount (0-10), Name and Direction, whence coming, of the Clouds. When the names of Upper and Lower Clouds are given, but only one Direction, this refers to the Lower Clouds. The Mean Direction of the Lower Clouds was E. On an average 52 per cent of the sky was clouded.
Table XI and XII exhibit the readings of the Barometer reduced to 32.0 Fahrenheit but not to Sea Level, at Victoria Peak, and the Thermometers at Victoria Peak and at Cape d'Aguilar.
The Mean Height of the Barometer at the Peak was 28.228. The Mean Temperature was 60.8 at the Peak and 68.1 at Cape d'Aguilar. The Highest was 73.7 on the 5th at the Peak and 83.8 on the 1st at Cape d'Aguilar, and the Lowest was 44.0 on the 22nd at the Peak, and 52.1 on the 22nd at 23rd at Cape d'Aguilar.
The Mean Temperature in Hongkong decreased one degree Fahrenheit for every 241 feet ascended. Table XIII exhibits the Relative Humidity as determined from observations of the Dry and Damp Thermometers. The Mean Relative Humidity at the Observatory was 67, at Cape d'Aguilar 76, and Victoria Peak 80. The Least Relative Humidity registered was 20 at 4 p. on the 22nd at the servatory, 37 at 4 a. on the 23rd, at Cape d'Aguilar, and 33 at 10 p. on the 21st at Victoria Peak. Table XIV exhibits the Tension of Aqueous Vapour at the Observatory and at the Peak. The an Tension was 0.490 at the Observatory, and 0.457 at the Peak. The Greatest Tension stered was 0.807 at 4 p. on the 5th, at the Observatory, and 0.724 at 10 a. on the 5th at the Peak. The Least Tension was 0.100 at 4 p. on the 22nd at the Observatory, and 0.112 at 10 p. on the 21st
the Peak.
Table XV exhibits the amount of Rain measured at 10 a. on the following day, and the duration Precipitation at the Observatory. The greatest amount fell on the 3rd when it rained 0.800 at the survatory, 0.56 at Cape d'Aguilar, and 0.64 at the Peak.
Unusual visibility was noticed on the 6th, the 7th, the 8th, the 9th, the 13th and the 19th. Dew fell on the evening of the 5th, the 25th, the 27th, the 29th, and the 30th.
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