680 SUPPLEMENT TO THE HONGKONG GOVT GAZETTE OF 1ST AUG., 1885.
of the Barometer was 30.119, the Highest was 30.295 at 10 a. on the 12th, and the Lowest was 29.935 at 4 p. on the 24th. The Barometric Tide amounted to 0.114.
Table II exhibits the hourly readings of the Temperature (Dry Bulb Thermometer) as measured from the Thermograms (at two minutes past the hour named), and also the Extreme Temperatures during the day. The Mean Temperature was 59.6, the Highest was 71.1 at about 1 p. on the 3rd. and the Lowest was 49.0 at 7 a. on the 30th.
Table III exhibits the hourly readings of the Temperature of Evaporation (Damp Bulb Thermo- meter) 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 saturated with moisture being 100) and Mean Tension of Aqueous Vapour present in the air expressed in inches of mercury, for every hour in the day and for every day in the month. The Mean Tension, which exhibits a great daily variation, was 0.318. The Mean Relative Humidity, which also exhibits an unusually great daily variation, was 62.
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 245.3 hours during the month. Table VI exhibiting the amount of Rain registered from half an hour before to half an hour after the hour named, is omitted as no rain fell during the month.
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 12.2 miles an hour. It was greatest during the middle of the day. The greatest Velocity, 33 miles, occurred at 11 p. on the 3rd.
The Total Distance travelled by, as well as the Duration and average Velocity of Winds from different quarters were as follows:-
Direction.
N
NE
......
E SE
S
SW
W
NW
Calm
Total Distance.
Miles, 2341
Duration. Hours.
Velocity. Miles per hour.
177
13.2
995
99
10.1
4920
325
15.1
580
79
7.3
38
11
3.5
19
5
3.8
113
14
8.1
42 22
7
6.0
27
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 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 3.7 corresponding to a Velocity of 21.5 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. On an average 26.5 per cent of the sky was clouded.
t
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 28.322. The Mean Temperature was 53.2 at the Peak, and 60.0 at Cape d'Aguilar. The Highest was 64.6 on the 3rd at the Peak, and 73.0 on the 14th at Cape d'Aguilar, and the Lowest was 41.0 on the 11th at the Peak, and 50.1 on the 30th at Cape d'Aguilar.
The Mean Temperature in Hongkong decreased one degree Fahrenheit for every 259 feet ascended. Table XIII exhibits the Relative Humidity as determined from observations of the Dry and Damp Thermometers. The Menn Relative Humidity at the Observatory was 62, at Cape d'Aguilar 72, and at Victoria Peak 69. The Least Relative Humidity registered was 20 at 4 p. on the 9th at the Observatory, 41 at 10 a. on the 11th at Cape d'Aguilar, and 26 at 10 p. on the 8th at the Peak.
Table XIV exhibits the Tension of Aqueous Vapour at the Observatory and at the Peak. The Mean Tension was 0.316 inches at the Observatory, and 0.281 inches at the Peak. The Greatest Tension registered was 0.522 at 10 p. on the 1st, at the Observatory, and 0.468 at 10 p. on the 3rd at the Peak. The Least Tension was 0.112 at 10 a. on the 9th at the Observatory, and 0.099 at 10 p. the 8th at the Peak.
on
On the afternoon of the 6th and during the following night light showers of rain, whose aggregate duration was 1 hour, passed but no rain was found in any of the gauges.
Unusual visibility was noted on the 7th and the 8th.
Dew fell on the 1st, the 14th, the 22nd, the 23rd and the 25th.