AnnualReport-1922 — Page 169

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Appendix F.

REPORT OF THE DIRECTOR OF THE ROYAL OBSERVATORY, HONGKONG, FOR THE YEAR 1922.

I.-GROUNDS AND BUILDINGS.

The grounds were kept in order by the Botanical and Forestry Department with the assistance of the Observatory coolies.

Excavations for an underground room for the seismograph and clocks were commenced in September.

Gas fires in all rooms, and 2 geysers, were installed in November.

II-METEOROLOGICAL INSTRUMENTS.

Barometers.-The Marvin compensated syphon barograph, which was set up in February, has worked well during the year, except that some mercury leaked at the ground joints.

The action of the barograph has been improved by the introduction of a buzzer, operated every minute for 0.7 second by a signal from the mean time clock.

The station barometer No. 1323 and the large Casella barometer are compared with the Observatory Standard usually once a month.

Beckley Anemograph.-This instrument was oiled and the orientation of the vane checked once a month.

Dines-Bawendell Anemograph.-The bearings of the vane were oiled and its orientation checked once a month. The spindle of the float was cleaned and oiled once a week. On March 26 a hole was drilled in the standard to permit of oiling the spindle above the mercury cup. The hole is closed by a screw to prevent the ingress of water or dust. The instrument requires frequent calibration. Its action at low velocities is uncertain.

The mean monthly results of comparisons with the records of the Beckley Anemograph from 1910-1921 are given in the following table, together with the results for 1922 :-

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Appendix F. REPORT OF THE DIRECTOR OF THE ROYAL OBSERVATORY, HONGKONG, FOR THE YEAR 1922. I.-GROUNDS AND BUILDINGS. The grounds were kept in order by the Botanical and Forestry Department with the assistance of the Observatory coolies. Excavations for an underground room for the seismograph and clocks were commenced in September. Gas fires in all rooms, and 2 geysers, were installed in November. II-METEOROLOGICAL INSTRUMENTS. Barometers.-The Marvin compensated syphon barograph, which was set up in February, has worked well during the year, except that some mercury leaked at the ground joints. The action of the barograph has been improved by the introduction of a buzzer, operated every minute for 0.7 second by a signal from the mean time clock. The station barometer No. 1323 and the large Casella barometer are compared with the Observatory Standard usually once a month. Beckley Anemograph.-This instrument was oiled and the orientation of the vane checked once a month. Dines-Bawendell Anemograph.-The bearings of the vane were oiled and its orientation checked once a month. The spindle of the float was cleaned and oiled once a week. On March 26 a hole was drilled in the standard to permit of oiling the spindle above the mercury cup. The hole is closed by a screw to prevent the ingress of water or dust. The instrument requires frequent calibration. Its action at low velocities is uncertain. The mean monthly results of comparisons with the records of the Beckley Anemograph from 1910-1921 are given in the following table, together with the results for 1922 :-

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Appendix F. REPORT OF THE DIRECTOR OF THE ROYAL OBSERVATORY, HONGKONG, FOR THE YEAR 1922. I.-GROUNDS AND BUILDINGS. The grounds were kept in order by the Botanical and Forestry Department with the assistance of the Observatory coolies. Excavations for an underground room for the seismograph and clocks were commenced in September. Gas fires in all rooms, and 2 geysers, were installed in November. II-METEOROLOGICAL INSTRUMENTS. Barometers.-The Marvin compensated syphon barograph, which was set up in February, has worked well during the year, except that some mercury leaked at the ground joints. The action of the barograph has been improved by the introduction of a buzzer, operated every minute for 0-7 second by a signal from the mean time clock. The station barometer No. 1323 and the large Casella barometer are compared with the Observatory Standard usually once a month. Beckley Anemograph.-This instrument was oiled and the orientation of the vane checked once a month. Dines-Bawendell Anemograph.-The bearings of the vane were oiled and its orientation checked once a month. The spindle of the float was cleaned and oiled once a week. On March 26 a hole was drilled in the standard to permit of oiling the spindle above the mercury cup. The hole is closed by a screw to prevent the ingress of water or dust. The instrument requires frequent calibration. Its action at low velocities is uncertain. The mean monthly results of comparisons with the records of the Beckley Anemograph from 1910-1921 are given in the follow- ing table, together with the results for 1922 :-

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Appendix F.

REPORT OF THE DIRECTOR OF THE ROYAL

OBSERVATORY, HONGKONG, FOR THE YEAR 1922.