This historic book may have numerous typos and missing text.
Purchasers can usually download a free scanned copy of the original
book (without typos) from the publisher. Not indexed. Not
illustrated. 1884 edition. Excerpt: ...loses more of its original
buoyancy--is such as to keep the whole apparatus at the bottom,
whilst the pull of the warp by which the trawl is towed along, is
in a direction slanting upwards. There are therefore two opposing
forces, one tending to keep the net on the ground, and the other
lifting it. The object is to regulate these forces so that the pull
from the warp shall move the trawl lightly along the bottom, but
without raising it from the ground. If then there be too little
warp allowed and there be not slope enough, the pull will be too
much upward, and the net will be lifted; but if, on the other hand,
there be too much warp, the trawl-irons and net will be dragged too
much on the ground, and the friction will be greatly increased. One
of the conditions on which this regulation depends is the amount of
wind; for if there be very little breeze to drive the vessel along,
the friction of the net and irons on the bottom may be sufficient
to stop her way entirely. In such a case, very little extra warp is
required, so that the lifting power may be increased, and the
friction over the ground lessened. But if there be a great deal of
wind, which will drive the vessel along even with comparatively
little sail, and especially if, as in such a case is likely to
occur, there is a good deal of sea, and the strain on the warp
becomes irregular and jerking, then more warp is allowed to
counteract the tendency there is to lift the net off the ground.
This, as has been said before, is a matter of experience; and the
ready way in which these rough fishermen make their calculations,
often, we may venture to say, without being able to explain their
reasons, is shown by the successful manner in which they commonly
fish in all kinds of weather. There...
|Country of origin:
||246 x 189 x 8mm (L x W x T)
||Paperback - Trade
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