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35
1 de dybere Lag. under 600 Favne, toges sjælden -At depths exceeding 600 fathoms we seldom took
Temperaturrækker, da Vandets Temperatur lier kun vari- serial temperatures, the temperature in the deeper strata
erede fra 0° til —1.°5. varying only from 0° to — 1°.5.
Dredging.
The apparatus
employed on the
Expedition for bringing up
animals from the
bottom of the sea
comprised the dredge, the
trawl, and swabs.
The Dredge. — This
instrument was on an
English pattern. The
frame is of hammered
iron, the length at the
mouth being to the
width as 7 to 1. From
the frame is suspended
a bag. into which, on
the dredge being
dragged over the bottom,
the long nether lip of
the mouth will scrape
in the substance of the
surface, along with the
marine animals it
contains.
For greater depths,
we had dredges of
three different sizes.
In the largest (Fig. 17).
the length of the lips.
or scrapers, was 4 feet,
in that of medium size
3 feet, and in the
smallest 21/2 feet. The
shape of the mouth was
the same in all three.
These instruments,
which had been made
in England for the
Expedition. did not. we
found, as originally
constructed. bring up a
fair sample of the
bottom; the freight was
invariably small, even
after protracted
dredging. We therefore,
when refitting at Thors-
Bundskrabning.
De Apparater, som
brugtes til at hente Dyr
o]) fra Havbunden, var
Skraber, Svabere og
Trawls.
Skrabe. Dette
Apparat var gjort efter
engelsk Mønster.
Skrabemunden bestaar af en
smedet Jernramme, hvis
Længde er omtrent 7
Gange saa stor som
Bredden. Til denne
er fæstet en Pose eller
Sæk. og det hele
drages langs Havbunden,
idet Munden med sin
nederste lange Læbe
afskraber det øverste
Lag af denne og
dermed de deri værende
Sødyr.
Af Sliraber for større
Dyb havde vi 3
Størrelser. Paa den
største. fremstillet i Fig.
17. var Læbernes
Længde lm.25 (4 Fod), paa
den mellemste Om.94 (3
Fod) og paa den
mindste Om.78 (21/s Fod).
Paa alle 3 var Formen
af Skrabemunden den
samme. Med den
oprindelige Form. som
Skraberne havde, da de
kom fra England, fandt
vi. at de tog for Lidet
af Bunden, og selv
etter lang Skrabning var
der altid meget lidet
i dem. Medens
Expeditionen laa i Thorshavn
i Begyndelsen af Juli
1876 og udbedrede den
/
Fig. 17.
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