IIIFカラー高解像度
国立情報学研究所 - ディジタル・シルクロード・プロジェクト
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| IIIFカラー高解像度 |
| Scientific Results of a Journey in Central Asia, 1899-1902 : vol.2 | |
| 1899-1902年の中央アジア旅行における科学的成果 : vol.2 |
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引用情報
THE LOP-NOR PROBLEM.
324
I have already said that I tested my instrument at Altmisch-bulak, and that a measured circle of 2756 m. gave a result of + o.0o1 instead of ± o.000. As it was impossible to determine the source of this error, whether it was due to the instrument, to the management of the . staff, or to the taking of the readings, I have not used it as a corrective of the figures in the above table; but even if it were an instrumental error, it is so insignificant that it neither affects the contourline, nor the result and object of the survey, which was to prove or disprove the presence of a depression in the northern part of the desert.
I am perfectly well aware, that a survey such as this, that is not controlled in any way either by fixed points determined beforehand or by a return to the point of departure, whereby one might distribute over the entire distance any error there might be — I am well aware that such a survey does not possess full scientific value. But as a rigidly scientific survey would have demanded not only more men, camels, and provisions than I possessed, but also time which I could not spare, the results I have obtained must pass for what they are worth until we are somehow possessed of better; and I will venture to express the hope, that if I am not myself permitted to carry out a more perfect survey, I may at least direct somebody else to do it on my behalf, that is to say a complete survey of the Desert of Lop, coupled at the same time with a fresh examination of the changes which are now taking place, and will take place in the immediate future, in the distribution of the water there.
Meanwhile, with the view of counterbalancing to some extent the weaknesses inherent in a single line of traverse, every possible care and precaution were taken, as I have already observed, and I place the fullest confidence in the accuracy of my survey, partly because of the pains taken, partly because of the experience I had already had at home in similar work, and partly, and this especially, because of the movements which we ourselves saw were taking place in the Kara-koschun. If therefore it should occur to any one to object, that the value 2.282 m., as the difference of altitude between the point of departure and the Kara-koschun, is probably too little, since it may be assumed that the staff at each turn sank in a trifle, and that this after 344 turns would amount to a considerable figure, I would reply, first, that the staff was handled with the utmost care, and, secondly, that if there is any error, it should run in the opposite direction, that is to say, the value 2.282 m. is rather too high, and the difference of elevation between the point of departure and the end of the traverse is more likely less than 2.282 m. than greater. And for this no other proof is required beyond the simple fact, that a few kilometers west of our
Distance travelled in m.
D a y.
Rise in m.
Fall in m.
I)il%rence in m.
I o March to Camp CLX
12 March to Camp CLXI . . r3 March to Camp CLXII . .
14 March to Camp CLXIII . .
15 March to Camp CLXIV . .
16 March to Camp CLXV . .
17 March to Camp CLXV I. .
9,140 11,201 13,007 11,250 16,239 16,271
4,794
17.2x7
24.883
23.306
3.588
8.668 + 7.91s
3.872
1 7.414
27.349
20.543
2.944
8.972
10.087 - 4.422
0.197
2.466 { 2.763
+ 0.644
0.304
2.172
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