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Af Trawls havde vi 2 Slags, begge leverede af I)r.
.T. Hearder & Son i Plymouth, nemlig Otter-Trawl og
Bom-Trawl.
Of Trawls we had two kinds, viz. the Otter-trawl and
the Beam-trawl, both furnished by Dr. I. Hearder & Son
of Plymouth.
Otter-Trawlen (Fig. 18) er nærmest et Fiskeapparat
og ikke særdeles meget skikket til zoologisk Brug: Det
bestaar af et Net. der er aabent foran og bagtil snevrer
sig sammen til en Spids. Til Netmundingen er fastgjort
2 Ottere eller firkantede. Træplader. U.m63 (2 Fod) høje,
hvis Underkanter er belastede med Jernmejer. Enderne
af Hanefoden, der forbinder Skrabetouget meel Trawlen,
er fastgjort til Stropper paa Indersiden af disse Ottere,
saaledes at de under Farten ved Vandtrykket skjærer ud til
hver Side. Overkanten af Netmundingen holdes oppe ved
Korkstykker, medens Underkanten er belastet med
Blystykker. Netmundingen er 7m.ö (24 Fod i bred mellem Otterne,
og Posens hele-Længde er 6.m3 f20 Fod).
The Otter-trawl (Fig. 18) is properly a fisherman’s
apparatus, and not very well adapted for scientific purposes.
It consists of a long conical bag of cord-netting, to the
mouth of which are attached two "otters.’" or quadrangular
pieces of wood. 2 feet square, each weighted on the lower
part with an iron runner. The ends of the crow-foot
connecting the trawl with the dredge-rope are secured to straps
on the inner side of the otters, in such manner as will
cause the latter, when in motion, to sheer out. or diverge,
from the action of the water. The top side of the mouth
of the net is kept in position by pieces of cork. the under
side being weighted with rolls of sheet-lead. The length
of the trawl-bag is 20 feet, and its width at the mouth,
measured between the otters. 24 feet.
To give the otters the right position, the trawl must
move through the water with a rapidity that, by reason
of the oblique direction of the dredge-rope, will easily
cause the apparatus to be lifted from the bottom.
Naar Otterne skal komme i Stilling, maa dette
Apparat gives saa stor Fart gjennem Vandet, at det paa
Grund af Tougets Visning paa større Dybder er udsat for
at løftes fra Bunden.
Fig. 18.
Fig. 19.
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