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Lodskud. Hvor Lodskucldene ligge meget tæt. ere kun de
mest characteriserende anførte i Kartet.
Som man ser, ere Lodskuddene ingenlunde jevnt
fordelte over Havet. De findes tættest ved Kysterne, paa
Kystbankerne og langs de af Expeditionen^ udsejlede
Linier. Mellem disse Linier staar der større tonnne Rum.
Som en Følge af denne Ujevnlied i Lodskuddenes Fordeling
lader Havbundens Topografi sig ikke paa alle Steder
fremstille med den samme Sikkerhed. Bedst bestemte ere
Kystbankerne og Bundens Skraaning mod Dybet paa den
østlige Side af dette, fra Nordsøen til Nord-Spidsbergen,
Øst-Havet, Strækningen fra Shetland over Færøerne og
Island til Dan markstrædet, Bankerne omkring disse Øer,
Bankerne og Skraaningen mod Dybet udenfor Øst-Grønland
fra den 70. til den 75. Breddegrad. Ganske godt bestemte
ere ogsaa de to Maximaldybder paa over 2000 Favne.
Paa alle disse Strækninger lade Isobatherne sig drage efter
Dybdetallene uden Tvetydighed.
Men der er andre Strækninger, hvor de
forhaandenværende Lodskud tillade forskjellige Tydninger af
Havbundens Fonn, nemlig:
a) Strækningen mellem Island, Færøerne og Rocka
li-Banken; her mangle Lodninger paa de dybere Partier.
Elisabeth-Banken, der paa tidligere Karter findes
aflagt söndenfor Island, har jeg ikke taget med, da dens
Existence er yderst tvivlsom, idet den forgjæves har
været eftersøgt af danske Krigsskibe i de senere Aar.
b) Vestsiden af Danmark-Strædet, hvor selve Kystens
Fonn endnu er ubekjendt.
c) Strækningen mellem Jan Mayen og Island. Det er
sikkert, at vi her have en Rende med over 1000
Favnes Dyb, menqRetningen af denne Rendes dybere
Partier lader sig ikke angive med Sikkerhed. Kartets
Isobather her ere trukne efter de Vink, som Studiet
af Temperaturens Fordeling i Dybet har givet mig.
Skraaningerne paa begge Sider af Renden kunne ved
nøjere Undersøgelser komme til at se anderledes ud.
Lodskuddet 700 Favne söndenfor Jan Mayen
hid-rorer fra "Hansa" og maa ansees paalidelig^ da der
blev taget Bundprøve med Loddet. Linien for 100
Favne er trukket efter Scoresby’s Opgave, at der
i en Afstand af 11 til 12 leagues i SSE for Sydkap
findes Ankergrund paa 35 til 3(5 Favne Vand. I
Sydost for Jan Mayen turde den stejle Skraaning mod
Dybet blive modificeret ved nye Lodninger.
d) Tegningen af den store Indbugtning i 1300 Favnes
Dyb nordenfor Jan Mayen er mig noget problematisk.
Lodskud mangle. Desværre hindrede Isen os fra at
komme hid, saaledes som det laa i min Plan.
e) Mellem Jan Mayen og Beeren-Eiland løfter sig
aabenbart en undersøisk Ryg. Men om den er ganske
made use of. When* the soundings lie very close together,
the most characteristic only have been set down on the chart.
As will be seen, the soundings are far from equably
distributed throughout the sea. They occur closest in the
vicinity of the coasts, on the coastal banks, and along the
lines forming the track of the Expedition. Between these
lines, extend the larger «unoccupied spaces. Owing to
this unequal distribution of tin; soundings, the topography
ol’ the sea-bed cannot be everywhere represented with equal
certainty. The best-defined portions are the coastal banks,
and the slope of the bottom towards the deep on the
eastern side of the latter from the North Sea to North
Spit/.bergen, likewise the Barents Sea, the tract stretching from
Shetland past the Færoes and Iceland to Denmark Strait,
the banks surrounding those islands, and the banks and
decline towards the deep off East Greenland, from the 70th
to the 75th parallel of latitude. Well defined also are the
two maximum-depths, each exceeding 2000 fathoms. Through
all these tracts of ocean, isobaths admit of being drawn
from the figures of depth, without ambiguity.
But there are other tracts, in which the soundings
taken will allow of a different explanation being given to
the form of the sea-bed, viz.:
a) The tract between Iceland, the Færoes, and the
Rock-all Bank; here we have no soundings in the deeper
parts. The Elizabeth Bank, placed on older charts
south of Iceland, I have not set down, its existence
being very doubtful, Danish men-of-war having of late
years sought in vain to find it.
b) The west side of Denmark Strait, where the contours
even of the coast are still unknown.
c) The tract between Jan Mayen and Iceland. It is
evident that we have here a channel more than 1000
fathoms deep; but the direction of the deeper parts
cannot be given with certainty. The isobaths on the
chart have1 been drawn from the results attained
by a study of the distribution of the temperature in
the deep strata. The slopes on either side of the
channel will, perhaps, after a closer examination, be
found to have a different appearance. The sounding
located 700 fathoms south of Jan Mayen, was taken
on board the "Hansa," and may bo considered
reliable, a sample of the bottom having been brought up
with the lead. The hundred-fathom line has been drawn
according to Scoresby’s statement, viz., that at a distance
of 11 or 12 leagues SSE from South Cape there is
anchorage in 35 or 3(3 fathoms of water. South-east
of Jan Mayen, the abrupt slope towards the deep will
possibly have to be modified after subsequent soundings.
d) The figure ol’ the large submarine bay, at a depth of
1300 fathoms, north of Jan Maven, appears to me
somewhat problematical. Soundings there are none.
Unfortunately, ice prevented us from reaching up to
that locality, as I had purposed according to my
original plan.
e) Between Jan Mayen and Beeren Eiland rises
manifestly a submarine ridge. But whether this ridge
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