394 SUPPLEMENT TO THE HONGKONG GOVT GAZETTE OF 10TH MAY, 1884.
Table IV exhibits the Relative Humidity in percentage of saturation (the Humidity of air saturated with moisture being 100) as determined from observations of the Dry and Damp Bulb Thermometers. The Mean Relative Humidity at the Observatory was 90, at Cape d'Aguilar 94, nt the Peak 96. The Least Relative Humidity registered at the Observatory was 68 at 10 a. on the 8th; 72 at 4p. on the 7th at Cape d'Aguilar; and 77 at 10a. on the Sth, and at 10 a. on the 29th at Victoria Peak.
Table V exhibits the Tension of Aqueous Vapour present in the atmosphere at the Observatory and at Victoria Peak, expressed in inches of mercury. The Mean Tension was 0.519 inches at the Observatory, and 0.486 inches at the Peak. The Greatest Tension registered at the Observatory was 0.724 at 10 a. on the 17th; and at the Peak 0.687 at 4 p. and 10 p. on the same day.
The Least Tension was 0.351 at 10 a. on 29th, at the Observatory; and 0.273 at 4 p. on the 9th at the Peak.
Table VI exhibits the amount of Rain measured at different stations at 10 a. on the following day, and the Duration of Precipitation at the Observatory. The greatest amount of Rain fell on the 6th, when it rained 1.987 at the Observatory, 1.40 at Stone Cutter's Island, and 1.80 at the Peak.
Table VII exhibits the amount of Rain registered during every hour at the Observatory. The greatest hourly Rainfall was 1.345 at 3 a. on the 7th.
Table VIII exhibits the Duration of Sunshine as measured by aid of the Sunshine Recorder at every hour. The Sun shone 60 hours during the month.
Table IX exhibits the Direction of the Wind in numbers (8-E, 16S, 24-W, 32-N) and the Velocity of the Wind in miles per hour as measured from the Anemograms. The Mean Velocity of the Wind was 19.2 miles per hour. The Velocity was greatest at sunrise and least at sunset.
as well as the Duration and average Velocity of Winds from
The Total Distance travelled by, different quarters were as follows:—-
Direction.
N
Total Distance.
Miles.
Duration.
Hours.
Velocity. Miles per hour.
266
31
8.6
NE
338
39
8.7
E
13,013
608
21.4
SE
307
29.
1.6
S
3
1
3.0
SW
44
4
11.0
W
219
20
11.0
NW
55
9
6.1
Calm
0
3
0.0
Table X 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. It appears that the Diurnal Variation was very small.
Table XI exhibits the Direction to two points and Force of the Wind (0-12) at Victoria Peak. The Mean Direction was ESE and the Force 3.9 corresponding to a Velocity of 22.5 miles per hour. -The Sea Disturbance (0-9) exhibited in the same table has been derived from observations made at
Cape d'Aguilar.
Table XII 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 prevailing Direction of the Wind at the Observatory, as exhibited in Table X, was E; at the Peak, as exhibited in Table XI, ESE; the prevailing Direction of the Lower Clouds was about SE and the Direction veered with increasing height, the Highest Clouds coming from W. On an average 87 per cent of the sky was clouded.
Drizzling Rain, while the instruments were being read off, was registered at the Observatory on the 1st at 10 a., the 6th at 10 a., the 9th at 10 p., the 10th at 10 a. and 4p., the 12th at 10 a., the 17th at 10 p., the 18th at 10 a., the 19th at 4 p., the 21st at 4 p., the 22nd at 10 p., the 24th at 10 p.,
and the 31st at 4 p.
It was raining while the instruments were being read off on the 5th at 10 p., the 18th at 4 p., 10 p., and the 21st at 10 p.
and
Dew fell on the 2nd at 10 p. and on the 20th at 10 p.
Unusual Visibility was noted on the 7th, 8th and 19th.
Fog was noted on the 15th, 16th, 17th, 26th and 31st.
Lightning and Thunder were noted on the 7th, 19th, 21st, 22nd, and 23rd, and Lightning without
Thunder was observed on the 27th and 31st.
Fog prevailed extensively at Cape d'Aguilar and at Victoria Peak.