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| 0118 |
Southern Tibet : vol.4 |
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line which took a little more than an hour, the maximum depths of 16.88 and 16.33 m.
were sounded about halfway, and on the second line the depth diminished in the
direction of our course: 15.15, 15.01, 13.60, 12.55, etc., the greatest depth being not
far from the northern shore, where the mountains were steep. At 1 o'clock p. m.
we had a temperature of 6.7° in the lake and of 3.5° in the air.
Steering S. 24° E. we finally reached what we supposed to be the southern
shore of the lake, and there the night was passed. By nearer examination it proved,
however, to be only a long narrow peninsula from the western shore, pointing straight
to the east, and dividing the lake into two basins, the southern a little smaller than
the northern. On the shore ducks were seen, as previously on *Lake Lighten*. The
beach was of the same kind as at *Camp XXIII*, a wall rather than a terrace.
On *September 29th* the southern basin was examined. The course now was
3 km. S. S. W., 3 km. S. 87° W., 4.5 km. N. 55° E., and 4.7 km. nearly north.¹ On
the second of these lines the greatest depth was 13.65 m. At the western shore
there are four very regularly built terraces, each about 2 m. high. From the slope
above them, Pan. 40, Tab. 7, was taken, giving an idea of the hills surrounding the
southern part of the lake. To the N. 55° E. the narrow sound is visible joining the
two basins. Wild yaks were seen to the S. E. On the third line, to N. 55° E.,
back to the sound, the greatest depth was 19.0 m. which proved to be the maximum
depth of the whole lake. At 1 o'clock p. m. the temperature was 6.3° in the water
and 1.9° in the air. The sound is about 60 m. broad, and the comparatively great
depth of several meters in its middle may depend upon currents caused by different
winds. With a strong S. W. wind the water will be driven from the southern to
the northern basin, and with a N. W. wind from the northern to the southern. Thus
the fine deposits in the sound are continually washed away. On the course to
*Camp XXV* we kept near the eastern shore where the depth nowhere exceeded 3 m.
On the way the delta of a brook is passed. This brook comes from the E. N. E.
and reaches the lake in a rather broad channel, surrounded with flat banks of silt
and sand. *Camp XXV* was pitched in the N. E. corner of the lake. At 6¾ o'clock
p. m. the usual storm came from E. N. E., a direction which during several days had
been prevailing in the evening and most of the night.
On *September 30th* our march goes E. N. E. in a nearly straight line for 16.2 km.
to *Camp XXVI*. Near this camp the boundary threshold of the basin of *Pool-tso* is
crossed at a height of 5,239 m. The height of *Camp XXV* is at 5,083 m., or 6 m.
above the surface of the lake. From *Camp XXV* to the threshold, a distance of 14.8 km.,
the ground, therefore, rises 156 m., or as 1:95. From the threshold to *Camp XXVI* is
1.4 km. or a fall of 98 m., as the camp is at 5,141 m.; the rate is here as 1:14.
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379
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393
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404
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416
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429
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441
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453
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464
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474
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484
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495
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505
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519
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529
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541
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552
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568
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583
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600
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615
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629
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643
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654
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665
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677
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692
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707
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725
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736
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746
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756
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