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0176 Memoir on Maps of Chinese Turkistan and Kansu : vol.1
中国領トルキスタンおよび甘粛の地図に関する覚書 : vol.1
Memoir on Maps of Chinese Turkistan and Kansu : vol.1 / 176 ページ(カラー画像)

New!引用情報

doi: 10.20676/00000215
引用形式選択: Chicago | APA | Harvard | IEEE

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154   APPENDIX B

METHOD OF REDUCTION, 1913-15 JOURNEY

Hypsometer readings, corrected for thermometer scale-error, were reduced to equivalent air pressure, and these were treated as fully corrected. Mercury barometer readings were corrected for scale-error and reduced to freezing point. Aneroid readings were treated as fully corrected. In this way each instrument yields a fully corrected pressure.

Next from a table, based on the International Meteorological Formula (1905) the height above a standard pressure level, 29.92, was read off. The result was multiplied by a factor, taking account of the mean air temperature. By means of the Indian Daily Weather Report chart, the value of pressure at sea-level at the station is estimated. Its difference from the value 29.92 multiplied by 873 is the necessary correction to the height in feet.. The differences between results of aneroid and mercury barometer were taken out, and applied to succeeding aneroid readings until the next comparison occurred. The same would have been doue for the hypsometer results, if it had been decided to retain them.

MISTAKES OF COMPUTATION

By a mistake on the part of the computer, uncorrected aneroid heights were given in

four cases in place of the corrected mercury heights.

Place   Height given

Places and corrections are as follows.

Correction   Final height

Toghrak-bulak

2740

+ 97

2837

B5sh-toghrak

1980

+ 32

2012

Kum-kuduk

2150

+ 95

2245

Lowaza

1890

+147

2037

RECORDS AND COMPUTATIONS

These are at Dehra Dim, in the Computing Office, Survey of India, and are available for reference.