Peter Parley's Annual, 1855: A Christmas and New Year's Present for Young People
General
Peter Parley's Annual, 1855: A Christmas and New Year's Present for Young People
Children's literature -- Periodicals; Gift books -- Periodicals
The making of the strand of a rope is now performed by machinery. A
frame consisting of a great variety of bobbins, each loaded with yarn
and posted upon a pivot so as to rotate easily, occupies one end of
the factory; the ends of all these yarns, from twenty to eighty, are
made to pass through an equal number of small holes in a convex plate
attached to the central machine, and then combined into one close
group. This group next passes through a tube, whose diameter is such
as to compress the yarns into close contact, and lastly is wound on
a large reel attached to the machine. Meanwhile the twist is given
to the strand by a remarkable arrangement—the whole of the machinery
from the tube to the reel rotates round a horizontal axis, and in so
doing imparts a twist to the strand, which is passing round the various
wheels. The different arrangements are very beautiful. In the first
place each bobbin rotating separately on its axle, gives off just as
much yarn as the strand requires, so that all become equally strained
by the outer yarns being somewhat longer than the inner. Then the
arrangement of the holes in the plate and of the tube bring all the
yarns to their proper position in the strand, and lastly by changing
the wheels in the machine, the strand becomes more or less hard by
twisting at a more or less acute angle. If the strand be drawn more
swiftly through, while the machine is revolving with a given velocity,
the intensity or closeness of the twist is diminished, if less swiftly
then the twist is increased. Such are some of the beautiful results of
machinery.
To twist the strands into a rope is called “laying” a rope. In the
laying walk a revolving wheel placed near the end is provided with
hooks, whereon the three strands to form the rope are fixed. These
hooks are made to rotate by the action of the wheel, its prime mover
being horse or steam-power. At the other end of the walk all the
strands are fixed to one hook, which revolves in an opposite direction
to the others. To equalize the hardness of the twist or lay, a conical
or rather bee-hived piece of wood called a “top” is inserted between
the three strands—groves being cut in the surface of the “top” for
their reception. This “top” thus placed prevents the strands from
twisting, except in the direction of the smaller end; while a man
stationed immediately behind, compresses the rope by a simple piece
of apparatus, and causes the twist to become hard and firm. The “top”
as the rope closes behind it is slowly urged on from one end to the
other—if small it is managed by a top-man, but if large it is supported
on a carriage, as in the engraving. No difference exists in making a
larger or smaller rope, so far as the principle is concerned. The three
strands are twisted round each other in the same manner by an apparatus
more or less powerful according to the size of the rope.
[Illustration]
Public-domain text, read in full here on John Shaqi.
Reviews
Reviews
No reviews yet
Be the first to share your thoughts on this work.
Elsewhere in the archive
Join the Discussion
Join the discussion
Sign in to leave a comment or review.
Sign InorCreate an account