Full resolution (JPEG) - On this page / på denna sida - Sidor ...
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has been proofread at least once.
(diff)
(history)
Denna sida har korrekturlästs minst en gång.
(skillnad)
(historik)
Two kinds of avalanches will be thus produced.
In the winter, when much snow has recently
fallen,—and this snow, from the absence of the
sun to overpower the continuous cold of both night
and day, remains a dry, incoherent powder,—it
must accumulate till it slips down in great
sweeping strata of dust, and thus form the “dust
avalanche” (the “staublauinen”): too well known as
a winter visitor to some of the Swiss valleys. In
the summer time, even above the snow-line, the
sun’s rays are powerful enough to thaw the
surface of the snow, and the water sinking into the
snow would partly freeze again below the surface,
while that upon the surface would freeze during
the night: thus a frozen, coherent mass of snow
must form, and when this gave way it would slide
down in lumps, forming the well-known summer
avalanche of the Alps and other mountain regions.
Now let us suppose our roof-shaped mountain
to be furrowed down its sides by the wear of these
descending avalanches, or of waters, so as to present
the form of a ridge-and-furrow slope, something
like the roof of the transept of the Crystal Palace.
The snow would, of course, accumulate in the
furrows, and soon become so deep that the melting
power of the summer heat would not clear it away
to the same height as before; while on the ridges
<< prev. page << föreg. sida << >> nästa sida >> next page >>
