114
E 3
With a view to the construction of Pilot Charts, the calculation of the means of the above observations is in progress. For the area comprised by the Equator and 25° North latitude and 100° to 125° East longitude the values for March and April are approaching completion.
For use in the same connection ten-yearly means (1896-1905) of the barometer readings made at lighthouses and other stations along the China Coast have been extracted. The stations so dealt with are as follows:- Pakhoi, Hoihow, Breaker Point, Lamocks, Chapel Island, Turnabout, Sharp Peak, Pei-yu-shan, Steep Island, Gutzlaff, North Saddle, Shaweishan, Northeast Promontory and Chefoo.
The wind prevalence for the same period has been determined for the following stations:- Breaker Point, Lamocks, Chapel Island, Turnabout, Pei-yu-shan and North Saddle.
A part of this work was completed in 1910.
12. A new standard barometer by Casella, London, No. 2451, was purchased in the spring. This instrument was compared with the standards of the Kew Observatory before being despatched to Hongkong. On arrival it was mounted beside the adopted standard of this Observatory, Negretti and Zambra No. 1368, which was brought out to the Colony in 1883 and which is the standard to which all the barometric observations made at this Observatory have been referred. The following gives the corrections to the instruments as determined at Kew:-
Year 1883. Negretti and Zambra No. 1368 -0.007".
Year 1912. C. F. Casella & Co. No. 2451 +0.005″.
A comparison between the two instruments, made here from June till October, after applying the original Kew corrections to both instruments, shows a difference of 0.002" in the sense that using the new instrument as standard the correction to the older instrument No. 1368 is 0.005" instead of -0.007". This is so far satisfactory that it is not proposed to make any change of standard, and the barometric observations will be referred to Negretti and Zambra No. 1368 as heretofore.
13. During the past year several hundred indirect comparisons of barometers and aneroids on board ship have been made. Several barometers and aneroids have been compared for various people in the Observatory.
14. The rainfall in inches registered by the gauge placed in the Police compound at Taipo, New Territories, was as follows:- January 1.99, February 0.53, March 3.70, April 8.65, May 21.36, June 5.19, July 12.41, August 36.33, September 7.60, October 5.57, November 3.65, December 0.10, the total for the year being 107.28 inches. On an average during the preceding five years the rainfall at Taipo was in excess of that recorded at the Observatory by 20 per cent. In 1911 it was 18 per cent. in excess.
114
E 3
With a view to the construction of Pilot Charts, the calculation of the means of the above observations is in progress. For the area comprised by the Equator and 25° North latitude and 100° to 125° East longitude the values for March and April are approaching completion.
For use in the same connection ten-yearly means (1896-1905) of the barometer readings made at lighthouses and other stations along the China Coast have been extracted. The stations so dealt with are as follows:-Pakhoi, Hoihow, Breaker Point, Lamocks, Chapel Island, Turnabout, Sharp Peak, Pei-yu-shan, Steep Island, Gutzlaff, North Saddle, Shaweishan, Northeast Promontory and Chefoo.
The wind prevalance for the same period has been determined for the following stations:-Breaker Point, Lamocks, Chapel Island, Turnabout, Pei-yu-shan and North Saddle.
A part of this work was completed in 1910.
12. A new standard barometer by Casella, London, No. 2451, was purchased in the spring. This instrument was compared with the standards of the Kew Observatory before being despatched to Hongkong. On arrival it was mounted beside the adopted standard of this Observatory, Negretti and Zambra No. 1368, which was brought out to the Colony in 1883 and which is the standard to which all the barometric observations made at this Observatory have been referred. The following gives the corrections to the instruments as determined at Kew:-
Year 1883. Negretti and Zambra No. 1368 -0.007".
Year 1912. C. F. Casella & Co. No. 2451 +0.005′′.
A comparison between the two instruments, made here from June till October, after applying the original Kew corrections to both in- struments, shows a difference of 0.002" in the sense that using the new instrument as standard the correction to the older instrument No. 1368 is 0.005" instead of -0.007". This is so far satisfactory that it is not proposed to make any change of standard, and the barometric observations will be referred to Negretti and Zambra No. 1368 as heretofore.
13. During the past year several hundred indirect comparisons of barometers and aneroids on board ship have been made. Several barometers and aneroids have been compared for various people in the Observatory.
14. The rainfall in inches registered by the gauge placed in the Police compound at Taipo, New Territories, was as follows:- January 1.99, February 0.53, March 3.70, April 8.65, May 21.36, June 5.19, July 12.41, August 36.33, September 7.60, October 5.57, November 3.65, December 0.10, the total for the year being 107.28 inches. On an average during the preceding five years the rainfall at Taipo was in excess of that recorded at the Observatory by 20 per cent. In 1911 it was 18 per cent. in excess.
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