614 SUPPLEMENT TO THE HONGKONG COVE GAZETTE OF 11TH JULY, 1883.
Table IV exhibits the Mean Relative Humidity in percentage of saturation (the humidity of air saturated with moisture being 100) and Mean Teusion of Aqueous Vapour present in the air expressed in inches of mercury, for every hour in the day and for every day in the mouth. The Mean Tension, which exhibits a small daily variation, was 0.698. The Mean Relative Humidity, which exhibits great daily variation, was 74.
a
Table V exhibits the Duration of Sun-shine as registered by aid of the Sun-shine Recorder from half an hour before to half an hour after the hour named. The Sun shone 238.9 hours during the
month.
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 3.085 inches. It rained during 26 hours. The greatest Hourly Rain-fall was 0.730 at 11 a. on the 1st.
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 15.1 miles an hour. It was greatest during the middle of the day. The greatest Velocity, 37 miles, occurred at 11 a. on the 1st.
The Total Distance travelled by, as well as the Duration and average Velocity of Winds from different quarters were as follows:-
Direction.
N
Total Distance.
Miles.
Duration. Hours.
Velocity.
Miles per hour.
1395
93
15.0
NE
1206
90
13.4
E
6931
386
18.0
SE
1403
100
14.0
S
113
24
4.7
SW
10
3
3.3
W
91
17
5.4
NW
50
6
8.3
Calm
21
25
0.8
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 regular 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 corresponding to 23 miles an hour. The Sea Disturbance (0-9) 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. Where 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, and of the Higher, W. On an average 39 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 28.196. The Mean Temperature was 69.8 at the Peak and 76.7 at Cape d'Aguilar, the Highest was 77.3 on the 6th at the Peak and 86.3 on the same day at Cape d'Aguilar, and the Lowest was 59.0 on the 22nd and 23rd, at the Peak, and 67.6 on the 16th and 21st at Cape d'Aguilar.
The Mean Temperature in Hongkong decreased one degree Fahrenheit for every 236 feet ascended. Table XIII exhibits the Relative Humidity as determined from 'observations of the Dry and Damp Bulb Thermometers. The Mean Relative Humidity at the Observatory was 74, at Cape d'Aguilar 81, and at Victoria Peak 86. These numbers are reduced to the mean of the 24 hours by aid of Table IV. The Least Relative Humidity registered was 28 at the Observatory, 46 at Cape d'Aguilar, and 44 at Victoria Peak.
Table XIV exhibits the Tension of Aqueous Vapour at the Observatory and at the Peak. The Mean Tension was 0.698 at the Observatory, and 0.632 at the Peak. The Greatest Tension registered was 0.906 at 4 p. on the 3rd, at the Observatory, and 0.819 at 10 a. on the 5th at the Peak. The Least Tension was 0.265 at 10 a. and 4 p. on the 22nd at the Observatory, and 0.291 at 10 a. on the same day at the Peak.
Table XV exhibits the amount of Rain measured at 10 a. on the following day, and the duration of Precipitation at the Observatory. The greatest amount fell on the 1st when it rained 1.960 at the Observatory, 1.41 at Stone Cutters' Island, and 1.45 at the Peak.
Faint lightning was observed on the evenings of the 3rd, 6th, 8th, 10th, and 13th.
On the 14th slight thunderstorms passed over at 1.30 p. and 3.15 p.
Unusual visibility was noticed on the 5th, the 11th, the 20th and the 21st. Dew fell in the evening on the 5th, the 6th, the Sth, the 29th, and the 31st.