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40
Farten standsedes. Med Stjerten haledes
Skrabetoii-get atter ind til Hakkebrættet og holdtes inde med Bugten
af en Elide. Til Stjerten i Pukkenholtskousen fastgjordes
en efter Dybden afpasset Vægt. hvortil brugtes 3 eller 4.
til de større Dybder 6 af Baillie-Maskinens Lodder, der
vejede 27 Kilogr. (55 Pd.) liver. Man slåp Tampen af
Enden, væltede Vægten overbord, og denne løb da med
Ko us en nedover langs Touget. indtil den standsedes af den
paa satte Trætærs. Dette kunde foles, naar man holdt
Haanden paa Touget.
Skibet laa nu stille, medens Lodder og Skrabe sank.
Vi regnede, efter tiere Forsøg, at der behovedes
^Minutter for at Skraben skulde synke 100 Favne. Skrabens
(eller rettere Trawlens) og Loddernes Synkning er anskue-
not less than double the depth, nay for smaller depths
even more.
The engine was now stopped, after which we hauled
in the dredge-rope, as before, to the taflrail, and kept it
up in a bight of rope’s end. With the lizard was then
made fast to the wooden thimble a weight proportioned to
the depth, consisting of 3 or 4. and for the deepest
dredg-ings, of as many as 0 of the sinkers of the Baillie
sounding-machine. weighing each 55 pounds. We now, after
letting go the rope. tilted the weight overboard, which spun
down along it till stopped by the wooden toggle. The shock
of its arrest was distinctly perceptible to a person who had
his hand on the rope.
The vessel was now kept stationary, while the
weight .and the dredge were sinking. After some
experience. we calculated the time required for the dredge to
sink 100 fathoms, to be about 12 minutes. Fig. 20 will
Fig. 20.
liggjort i Fig. 20. Den i Figuren antagne Dybde er 1300
Favne, følgelig er Skib og Trawl tegnet i forstørret
Maalestok. De prikkede Linier viser Loddernes.
Skrabetoughex-ens og Trawlbommens Bane under Synkningen, under
Forudsætning af, at Trawlen synker med en Hastighed, der er
lidt mindre end den, hvormed Lodderne nærmer sig Bunden.
Idet Lodderne naar Bund. svæver endnu Trawlen i Vandet,
og det sidste Stykke af dens Bane vil være næsten lodret.
Erfaring viste, at Trawl og Skrabe med den brugte
Fremgangsmaade i Regelen uden Vanskelighed kom i rigtig
Stilling paa Bunden. Er Skrabens (Trawlens) Synken meget
langsommere end Loddernes, vil den falde lodret ned paa
Bunden med sin tunge Ende foran. Er derimod dens Svn-
give an idea of the descent of the dredge, or rather of the
trawl. The supposed depth in the diagram being 1300
fathoms, the vessel and the trawl are of course on a much
larger scale.. The dotted lines represent the lines of
descent of the weight, the shackle, the dredge-rope, and
the beam of the trawl. — assuming the trawl to sink more
slowly than the weight. When the weight strikes the
bottom. the trawl has still some distance to travel, and the
last part of its line of descent will be well-nigh
perpendicular. We found that, when worked in the manner
described above, both trawl and dredge could as a rule
without difficulty be made to reach the bottom in the right
position. If the dredge or trawl descend much more slowly
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