618 SUPPLEMENT TO THE HONGKONG GOVT GAZETTE OF 26TH JULY, 1884.
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 74.8 the Highest was 87.5 at about 3 p. on the 17th and the Lowest was 64.1 at about 4 a on the 13th and 14th.
Table III exhibits the hourly readings of the Temperature of Evaporation (Damp Bulb Thermo- incter) 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 suturated with moisture being 100) and the 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 did not vary much during the 24 hours, being however somewhat greater during the hottest than during coldest part of the day, was 0.736. The Mean Relative Humidity, which exhibits a great
aily variation, was 85.
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 99.1 hours during the month.
Table VI exhibits the amount of Rain registered from half an hour before to half an hour after he hour named. The Total Rain-fall during the month was 9.039. inches. The greatest Hourly Rain-fall was 1.135 at noon 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 umber 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 12.9 miles an hour. It was greatest during the middle of the day. The Velocity did not exceed 30 miles an hour on any day.
The Total Distance travelled by, as well as the Duration and average Velocity of Winds from different quarters were as follows:
*
Direction.
Total Distance.
Duration.
Velocity.
Miles.
Hours.
Miles per
hour.
N
315
46
6.8
NE
430
48
9.0
E
7,135
448
15.9
SE
339
37
9.2
*
S
410
41
10.0
SW
659
54
12.2
W
159
19
8.4
NW
159
24
6.6
Calm
20
27
0.7
The 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. The Diurnal Variation of the latter was very small.
The IX exhibits the Direction (to two points) and Force of the Wind (0-12) at Victoria Peak. The Average Force of the Wind was 3.9 corresponding to a Velocity of 22 miles per 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 prevailing Direction of the Wind at the Observatory, as shown in Table VIII, was E;
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