Appendix F.
REPORT OF THE DIRECTOR OF THE ROYAL OBSERVATORY, HONGKONG, FOR THE YEAR 1924.
1.-GROUNDS AND BUILDINGS
The grounds were kept in order by the Botanical and Forestry Department with the assistance of the Observatory coolies.
Underground Chamber for Seismograph and Clocks.--As the scale value of the thermograph supplied by Messrs. Short and Mason was too small for satisfactory registration of the minute changes of temperature in the Underground Chamber, magnifying levers were constructed and fitted by Mr. Evans. In October, after several trials, with levers of various dimensions, counter-poised and uncounterpoised, and the introduction of a buzzer, he succeeded in obtaining satisfactory registration with a scale value of 0.6 inch to 1°C. The buzzer is fixed on a brass frame screwed to the supports of the dry and wet bulb thermometers. It is operated for 1 sec. every minute. Such high magnification is only feasible in conjunction with a buzzer, or other device for overcoming the combined effects of inertia and friction.
The records are standardized by 4-hourly readings of dry and wet bulb thermometers, graduated to 0.1°C and read to 0.01°C by estimation. They show that the diurnal inequality of temperature in the Underground Chamber is small, but greater than indicated by the thermograph in its original condition.
In the following table the mean temperature of the air and humidity, at 4-hourly intervals, for November and December, 1923, are compared with the corresponding figures for 1924 :-
Month and Year 0h. 4h. 8h. Noon. 16h. 20h. Range. Nov. 1923 75.28 75.23 75.24 75.25 75.27 75.23 0.05 Nov. 1924 76.23 76.23 76.23 76.15 76.25 76.32 0.17 Dec. 1923 72.72 72.64 72.63 72.66 72.68 72.68 0.09 Dec. 1924 72.93 72.82 72.86 72.90 72.88 72.95 0.13Temperature of air in Underground Chamber.
Appendix F.
REPORT OF THE DIRECTOR OF THE ROYAL OBSERVATORY, HONGKONG, FOR THE YEAR 1924.
1.-GROUNDS AND BUILDINGS
The grounds were kept in order by the Botanical and Forestry Department with the assistance of the Observatory coolies.
Underground Chamber for Seismograph and Clocks.--As the scale value of the thermograph supplied by Messrs. Short and Mason was too small for satisfactory registration of the minute changes of temperature in the Underground Chamber, magnifying levers were constructed and fitted by Mr. Evans. In October, after several trials, with levers of various dimensions, counter- poised and uncounterpoised, and the introduction of a buzzer, he succeeded in obtaining satisfactory registration with a scale value of 0.6 inch to 1 (C). The buzzer is fixed on a brass frame screwed to the supports of the dry and wet bulb thermometers. It is operated for I sec. every minute. Such high magnification is only feasible in conjunction with a buzzer, or other device for overcoming the combined effects of inertia and friction.
The records are standardized by 4-hourly readings of dry and wet bulb thermometers, graduated to 01 (C) and read to 001 (C) by estimation. They show that the diurnal inequality of temperature in the Underground Chamber is small, but greater than indicated by the thermograph in its original condition.
In the following table the mean temperature of the air and humidity, at 4-hourly intervals, for November and December, 1923, are compared with the corresponding figures for 1924 :-
Temperature of air in Underground Chamber.
Month and
Year
0.
43.
8b. Noon. 16h. 20h.
Range.
こ
1923
75 28 7523 7524 7525 75°27 7523
0°05
Nov.
1924762376-23 7623 7615 76 25 76'32
| |
0:17
1923
7272 72647263 72.66 72-68 72-68
0'09
Dee.
1924
729372-82 72.86 7290 72.88 72-95
0'13
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