Southern Tibet : vol.4 / 385 ページ（カラー画像）

0385	Southern Tibet : vol.4
南チベット : vol.4

0385

Southern Tibet : vol.4

南チベット : vol.4

are large valleys from the left. These valleys from different directions, join in the
sharp bend where the main valley turns to the north and N. E. On both sides there
are wild steep rocks of very picturesque forms. Heaps of gravel, blocks and boulders
fill the valley. The brook increases and is nearly perfectly free from ice, foaming
in continuous rapids in its stony bed. The valley is very narrow, but there is still
room for small cultivated fields and a few huts. Here are many well-built *manis,*
some of original form. The valley turns more and more to the right, and finally
we reach *Tankse.*

Here the first part of my journey in Tibet in 1906—1908, came to an end,
and the great ring was closed. I had left *Tankse* on *August 21st* 1906, and now
returned there on *November 26th,* 1907, the journey thus having taken one year,
three months and seven days. Here we have, therefore, a means of controlling the
exactitude of my field map, disregarding the astronomical observations and all other
corrections from determined points, amongst which those of Ryder are the best.
Colonel H. Byström has made such a graphic examination by joining all the 26 sheets
which were constructed by Lieutenant C. J. O. Kjellström to the scale of 1 : 200 000.
Drawing my field maps I only made use of compass and watch and determined the
distance by means of the length of the paces of my riding pony. Under such con-
ditions as those in which this journey was made and which have been described
above and in Vol. II and III of this work, one would expect a very large error.
The continual winter storms, the cold, and the sometimes unfavourable ground, would
very likely make the field map uncertain. My several crossings of the *Manasarovar*
were, however, omitted, but the crossings of Lakes *Lighten, Yeshil-köl, Pul-tso*
and *Ngangtse-tso,* as well as one days' journey on the *Tsangpo* and one on the
*Indus* had to be included in the graphical calculation of Colonel Byström. Along
the route of my fieldbooks, from *Tankse* and back to *Tankse,* he got a distance of
4,270 km. On the construction the length-error proved to be 109.5 km. or 2.56%
of 4,270, and the cross-error 1.52%, which may indeed be said to be a satisfactory
result. Or, in other words, for a distance of 100 miles I would get, as an average,
102.56 miles. On the map in 15 sheets in 1 : 1,000,000, accompanying this work,
Colonel Byström has tried to bring my field survey as much as possible in accor-
dance with all other data existing.

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
『東洋文庫所蔵』貴重書デジタルアーカイブ

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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 『東洋文庫所蔵』貴重書デジタルアーカイブ

引用情報

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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
『東洋文庫所蔵』貴重書デジタルアーカイブ