رسائل وأوراق بخصوص السكة الحديدية العابرة لبلاد فارس والسكك الحديدية الأخرى في بلاد فارس [و‎‎١‎٠‎٤] (٤٤٢/٢٠٧)

10.
Here it bends due South, Grosses the Kohfl-Sultan ran^re where
its destructive effects are to be found, written with no
uncertain hand, in the ,-rctesquo shapes into vdiioh this mountain
has been chiselled and in the msses of sand which it has flunrs
soirie thousand of feet high, against the Northern elope of that
mountain, and proceeding on its course South, across Nashkel
and Hater an, finds its end in the Persian Gulf. In Seietan it is
known as the a 8ed Sud—0—Bist Puz' (the wind of the one hundred
and twenty days), for every morning, in Sumer, with almost
unfailing regularity it puts in its appearance, attains its
maximum rather after the sun has past its zenith, and dies av/ay,
in the evening. During the months which Immediately precede
and follow summer, this wind stream is somer/hat intemrdttent, but
in winter, at intervals which may extend to as much as even three
weeks although usually much less, it becomes an icy blast which
overflows its channel, on either side, long distances and attains
a strength and velocity the sumer months rarely ever see. The
general causes which produce this wind are well known, but,
while so, the reasons which operate to confine it to the course
it follows and what it is that gives this wind its truly
surprising strength, are not and would form a study for the
scientist as engrossing as it would prove useful. In her wind,
Seistan possesses an economic power of great potential value.
D. Sand .
Sand is generally formed in one of two different ways,
v.i.z. either by the pulverisation of rooky debris, brought down
by erosion, by water action, or by the disintegration of beds,
usually conglomerate, eaten away by the wind. For the latter, the
essentials are extremes of heat and cold, /Treat variation between
the day and night temperatures, an intensely dry climate, a
meagre rainfall, and a surface which permits full play to wind
action. These conditions reach, perhaps, the highest collective
maximum possible on the great plains areas, in review. As