Rit (Vísindafélag Íslendinga) - 01.07.1931, Page 20

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Fig. 9. The middle-peak from N. lsh 1930.
The temperature of 2 ,5 at the firnlimit might indicate an
effective precipitation (precipitation minus evaporation) of
1700 mm. per year in the glacier region.
The Skridjökuls and the Fixing Marks. As I am
not at present able to give a satisfactory description of the
whole margin of the glacier and the skridjökuls, I prefer to
give only a brief account of what I saw on my trip last
summer.
I had only three days at my disposal of which the first
was spent in going to the top of the glacier. The walk
from Stapi to Þríhyrningar took 3.5 hours. On the eastern
slope a moraine ridge, only partly covered with snow, may
be followed up to Þríhyrningar. This ridge is probably an
old middle moraine from the time, when the glacier was
much thicker and the two glaciers that now creep down on
both sides of Þríhyrningar were united in one. — The glacier
on the north side is the largest of the two, or about 2 km.
in length and 3 — 4 km. in breadth. It extends down to the
softly sloping Jökulháls and seems to have rather irregular
movements. This skridjökull is the only one known by Th.
Thoroddsen as worth of mention.
From Þríhyrningar to the top the glacier slopes gently and
it was covered with rather thick snow from Iast winter.