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 |
| Overland to India : vol.2 | |
| インドへの陸路 : vol.2 |
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引用情報
L CLIMATIC CHANGES IN PERSIA 219
have added that the greater the distance from the foot of
the hills the more insignificant becomes the fall. Thus
I found on the stretch of road from Teheran to Veramin,
34 miles, a fall of only 705 feet ; and from Jandak to
the edge of the Kevir 787 feet in 20 miles. From
Turut to the edge of the Kevir the fall was 358 feet in
9 miles, but from the Kevir to Sadfe 715 feet in about
6 miles.
The fall in the border zone outside the great Kevir is,
then, exceedingly trifling. But yet it is everywhere clearly
marked, and observations of altitude show that the stable
ground round a kevir basin always falls towards its edge.
The fine silt deposits which are called kevir are always
situated in the lowest depression of a basin. Tietze appeals
to the sunken basin form as evidence against Blanford's
theory that lakes formerly existed in these basins. But is
it so absolutely certain that the slope in the marginal
region, of which Blanford speaks, extends right across the
whole basin, that is to say, that the fall is the same (2000
feet in io miles) down to the deepest part, and that a
similar rise then begins at once ?
The following determinations of heights give a clear
notion of the relief along a line from south to north, from
Jandak to Sadfe :-
Jandak . 3274 feet.
Hauz-i-Haji-Ramazan . 2556 „
Kevir, February 3, 7 A.M. 2487 „
I P.M. 2369 ,,
» 3, 9 ,, 2247
3 ,, 2326
4, 9 2356 „
Sadie 3071 „
We therefore find, both on the south and north, a more
rapid fall to the edge of the Kevir, but as soon as we come
out on to the Kevir the ground becomes practically level,
and the small differences in the barometer readings may
very well be caused by atmospheric disturbances. The
Kevir has a breadth of 68 miles, and the greatest difference
of height observable in this distance is 240 feet.
On the eastern line, where the crossing was accomplished
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