41 SUPPLEMENT TO THE HONGKONG GOV"- GAZETTE OF 31st MAY, 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 67.8, the Highest was 83.9 at 1 h. 18 in., p. on the 26th, and the Lowest was 54.7 at 2 h. 47 m., a. on the 2nd.
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 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 0.594. The Mean Relative Humidity, which exhibits a great daily variation, was 86. It appears from this that while the amount of vapour remained nearly constant, the air was further removed from saturation during the hottest part of the day, than during the early morning hours.
Table V exhibits the Duration of Sun-shine as recorded by aid of the Sun-shine Recorder from half an hour before to half an hour after the hour named. The Sun shone 79.7 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 5.261 inches. The greatest Hourly Rain-fall was 1.055 at 9 a. on the 12th.
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 16.5 miles an hour. It was greatest during the middle of the day. The Velocity exceeded 35 miles an hour on the 2nd and the 27th.
The Total Distance travelled by, as well as the Duration and average Velocity of Winds front different quarters were as follows :-
Direction.
Total Distance.
Duration.
Velocity.
Miles.
Hours.
Miles per hour.
N
353
36
9.8
NE
547
46
11.9
E
9,921
511
19.4
SE
277
22
12.6
S
284
26
10.9
SW
133
14
9.5
W
175
26
6.7
NW
158
25
6.3
Calm
5
14
0.4
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. The Diurnal Variation of the latter was very small.
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 4.0, corresponding to a Velocity of 23 miles per hour. The Sea Disturbance (0-9) exhibited in the same table has been derived from observations made at Cape d'Aguilar.
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