SUPPLEMENT TO THE HONGKONG GOVE GAZETTE OF 27 JUNE. 1885. 573
from Manila, where the barometer as far as can be gathered from the telegraphic reports reached its minimum 29.80 at 4 p. At sea west of Luzon a hard gale and a heavy sea were encountered. north of China the weather was fine and the winds light. Detached clouds were registered in southern In the China and it rained in Formosa. Luzon, where the barometer had risen. Moderate E or NE breezes blew along the southern coast of At 10 a. on the 27th light ESE and SE breezes were reported from China, where the sky was partly overcast. the China sea NE gales and a rough sea were encountered as also on the following day. From these On the 28th fresh or strong NE breezes prevailed and in data it may safely be concluded, that a depression, which passed south of Manila on the evening of the 26th, entered the China Sea, but whether it was accompanied by winds blowing with Typhoon force and how long it lasted cannot be ascertained from the meagre data available. Most likely it was of but short duration as it entered the sea is such a low latitude,
The Barograph and the Standard Barometer at the Observatory are placed 110 feet above Mean Sea Level. The bulbs of the Thermograph Thermometers are 111 feet above Mean Sea Level and 6 feet above the ground. They are exposed in an unpainted and double-louvered zinc screen fixed to the north wall of the main building in a shaded position. The Solar Radiation Maximum Thermome- ter is 109 feet above Mean Sea Level and 4 feet above the ground, and the Terrestrial Radiation Minimum Thermometer is about one inch above the ground. The self-recording Rain-gauge is placed 106 feet above Mean Sea Level, and the rim, which is 11 inches in diameter, is 21 inches above the ground. The cups of the Anemograph are 45 feet above the ground, and 150 feet above Mean Sea Level.
out.
At Victoria Peak the Instruments, except the Radiation Thermometers, are placed in the Look- The Barometer is 1821 feet above Sea Level. The bulbs of the Thermometers are about 4 feet above the floor, except the Maximum Thermometer, which is a few inches higher. The Radiation Thermometers are placed at the same height above the ground as at the Observatory. At Cape d'Aguilar the Thermometers are placed about 170. feet above Sea Level (according to the Government Gazette) in a wooden screen 2 feet above the ground, except the Maximum Thermometer, which is a few inches higher.
Table I exhibits the hourly readings of the Barometer reduced to 32° .0 Fahrenheit, but not to Sea Level, as measured (at two minutes to the hour named) from the Barograms. The Mean Height of the Barometer was 29.685, the Highest was 29.912 at 9 a. and 10 a. on the 28th, and the Lowest was 28.876 at 2 a. on the 11th. The Barometric Tide amounted to 0.072.
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 81.2, the Highest was 91.5 at about 4 p. on the 6th and the Lowest was 74.6 at 6a. on the 23rd.
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 small daily variation, was 0.811. The Mean Relative Humidity, which exhibits a great daily variation, was 76.
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 238.1 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 12.370 inches. It rained during 49 hours.
The greatest Hourly Rain-fall was 1.190 at 7 p. on the 10th.
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, 32N) 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.