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 never been proofread. / Denna sida har aldrig korrekturlästs.
41
ken ligesaa hurtig som Loddernes eller hurtigere, vil den
komme til Bunds med en horizontal Component i sin
Bevægelse. hvilket vistnok vilde være det sikreste Middel til
at den blev klar under den følgende Bundskrabning.
Saasnart Skraben antoges at have naaet Bund,
kastedes Touget los forud og Bugten bragtes agterover. lagdes
ind i Fodblokken (a, Fig. 2) i Agterkant af Hytten og
derpaa om Spiltapperne om Styrbord, saaledes som Fig. 1
viser.
Med 1, l1, - og 2 Knobs Fart og samme Kurs som
tidligere blev nu Skraben trukket henover Havbunden, idet
Vægten i Forhaand holdt den første Del af Touget ned.
saa at Draget blev horisontalt eller næsten horizoutalt. og
Skrabemunden ikke let løftedes fra Bunden. Under
Skrab-ningen maatte man stadig have Opmærksomheden henvendt
paa Accumulatoren. Dens Udvidelse og pludselige
Sammentrækning igjen angav, naar Skraben tog Tag og atter
slåp Bunden, og selvfølgelig angav den ogsaa, naar Skraben
satte sig fast. Naar Accumulatoren i dette Tilfælde havde
udvidet sig saa meget, at man i den låve Stilling, som
Loddeblokken indtog, ikke vilde have mere Kraft paa
Touget. kommanderedes "Fir "! og Maskinisten ved
Indhivnings-maskinen, som for dette Tilfældes Skyld altid stod klar,
reverserede Maskinen og firede ud. paa samme Tid som
Skibets Fart standsedes. I Regelen tik man Skraben løs
ved at hive ind igjen paa Touget. Stod Accumulatoren
stadig paa samme Mærke, antydede dette som oftest, at
Farten var for stor. og at baade Vægt og Skrabe slæbtes
gjennem Vandet fri af Bunden. For at have et Varsko,
naar Accumulatoren pludselig udvidede sig over den
tilhor-lige Grændse. fastgjordes undertiden en Line med den ene
Ende i Accumulatoren og med den anden i Damppiben,
der saaledes peb. strax Accumulatoren blev for lang.
Skrabningen fortsattes ofte indtil et Par Timer, førend
man begyndte Indhivningen. Under denne var Farten
standset, og man lod Skibet drive tilbage. I Regelen
foregik Indhivningen hurtigere end Skibet drev. saa at Touget
viste klart ud i Læ. I modsat Fald gik man rundt med
Fartøjet, lagde sig paa Læ Side af Touget og drev da
tilsidst over Skraben.
Med fuld Fart paa Indhivningsmaskinen tog den ind
100 Favne i 6 å 7 Minutter. Var Skraben meget tung,
maatte der hives langsommere. Eftersom Touget kom ind,
haledes det fra Spillet over Hytten forefter og blev atter
opskudt klart i Bingen forud. Dette var et meget
anstræn-gende Arbejde, navnlig naar Indhivningen. som enkelte
Gange Tilfældet, gik uden Stands i 4 til 5 Timer.
Den norske Nordhavsexpedition. C’. Wille: Apparaterne og deres Brug.
than the weight, it will fall vertically, with the heavy end
foremost. If. on the other hand, its rate of descent be
equal to or exceed that of the weights, it will, on reaching
the bottom, have a horizontal component in its motion.
— which is pretty sure to keep it from clogging during the
ensuing operation.
So soon as the dredge, by our calculation, had
reached the bottom, the rope was cast off forward, the bight
brought aft. rove through the leading-block (a. Fig. 2) on
the after part of the roundhouse, and then passed round
the starboard drums, as shown in Fig. 1.
Steaming ahead at the rate of 1. I1/», or 2 knots, on
the same course as before, the dredge was pulled along the
bottom, the tension of the motion of the vessel not
however acting immediately upon it. but dragging forward the
iron sinkers, which by their great weight serve to keep the
direct traction horizontal, or nearly so. and thus prevent
the mouth of the dredge from being readily lifted up. In
dredging we had to keep our attention constantly fixed on
the accumulator. Its extension and sudden contraction
was a sure sign that the dredge was working properly, and
of course the accumulator also told us when the dredge
had fouled the bottom. A great and increasing strain upon
the rope. pulling down the block and seriously stretching
the accumulator, showed the dredge to have stuck fast, in
which case we gave the word to veer, and an assistant
engineer, who always stood ready for that purpose, reversed
the donkey-engine and paid out the rope. the ship’s
way, too. being immediately deadened. By hauling in
the rope we generally succeeded in extricating the dredge.
Sometimes, the accumulator would remain stretched at
the same point, and this we as a rule found to indicate
that the speed of the vessel was too great, both weight
and dredge being dragged through the water clear of
the bottom. To give notice of any sudden stretching of
the accumulator beyond the safe limit of extension, we
hit on the expedient of fastening one end of a line
to the apparatus and the other to the steam-whistle, which
in that case would sound on the elastic bauds running out
too far.
Dredging from the "Vöringen" was frequently carried
on for a couple of hours before hearing in. During the
latter operation the vessel drifted before the wind. The rope
being in the majority of cases brought in at a rate
exceeding the drift of the ship, pointed leeward. If not. we
steamed the vessel round, to get the rope to windward
and drift over the dredge.
Working at full speed, the donkey-engine brought in
100 fathoms of dredge-rope in (j or 7 minutes. When the
dredge had got a very heavy freight to bring up. we heaved
at a slower rate. As the rope came in. we hauled it from
the drum of the engine over the roof of the roundhouse,
and thence forward into the locker, where it was again
coiled ready for the next operation. This was very
fatiguing work indeed, particularly when the engine, as was
6
<< prev. page << föreg. sida << >> nästa sida >> next page >>
