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    Handbook of Knotting and Splicing
    Handbook of Knotting and Splicing
    Handbook of Knotting and Splicing
    Ebook239 pages1 hour

    Handbook of Knotting and Splicing

    By Paul N. Hasluck

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    About this ebook

    Generations of scouts and sailors have learned their lore from this classic reference by a master craftsman. Editor Paul N. Hasluck was a renowned contributor to numerous technical journals as well as the author of several books on crafts and antiques. His clearly written guide--amply illustrated with 208 figures--dates from the turn of the twentieth century and offers timeless instruction for knotters and splicers of ropes.
    Starting with simple and useful knots, this manual proceeds to more complex varieties: eye knots, hitches, and bends; ring knots and rope shortenings; ties and lashings; and fancy knots. Additional topics include rope splicing; working cordage; hammock making; lashings and ties for scaffolding; and splicing and socketing wire ropes. A helpful index appears at the end, and a list of illustrations identifies the figures in order of appearance.
    LanguageEnglish
    PublisherDover Publications
    Release dateNov 1, 2012
    ISBN9780486148168
    Handbook of Knotting and Splicing
    Author

    Paul N. Hasluck

    Paul Hasluck (1854–1931) was an Australian-born writer and engineer, who moved to the United Kingdom before the 1880s. Hasluck was a leading writer of do-it-yourself guides and wrote technical handbooks. Alongside authoring 40 of his own works, Hasluck also edited many texts.

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      Book preview

      Handbook of Knotting and Splicing - Paul N. Hasluck

      208

      CHAPTER I.

      INTRODUCTION: ROPE FORMATION.

      KNOTTING is an ancient device with which very early inhabitants of this earth must have been acquainted. From the beginning, mankind must always have used some kind of knot to join animal sinews, plant fibres, or hide strips which, in ancient days, were the prototypes of the varieties of cordage now employed.

      A large number of knots has been invented by the skill of man, and on their strength and correct tying depend the lives of thousands and thousands of workmen—seamen, building trade operatives, etc., day by day. The importance of being able to make the knot best suited for the occasion both rapidly and correctly may come in a new light to some when it is pointed out that both lives and property have over and over again been sacrificed to ill-made knots ; and this little volume is put forward in the belief that few things better repay the workman’s time and trouble in learning than the manipulation of ropes and cordage.

      Cordage is used almost daily by everyone in some form or other, but comparatively few can handle it methodically. Men break their nails and teeth gnawing at their own knots endeavouring to untie them, and time and material are wasted. Time spent in learning a few of the simple bends and hitches, reliable under strain and easy to unbend when the strain is released, would never be regretted. It is not necessary for a landsman to learn all the numerous uses to which rope is put, but a knowledge of common bends is an inestimable convenience, if not a necessity.

      The security of a knot ought not to be, as many seem to think, in the number of turns or hitches in its composition, but in the efficacy of the nip. A bend or hitch must be so formed that the part of rope under strain nips some portion of the knot, either against itself or the object to which it is attached ; and in learning a bend, or impressing it upon one’s memory, it will be found most helpful to notice particularly the nip of each separate one as it is studied.

      Rope, though usually of hemp, is made of other materials for certain purposes. Coir rope (cocoanut fibre), being light and buoyant, is useful for warps, rocket lines, life-buoy lines, and drift-nets. Manilla grass is adapted for reef points, yachts’ hawsers, and wherever tar would be injurious. Hide is required for wheel-ropes, or where great strength with pliability and small circumference is needed. Cotton is serviceable for fancy work, etc. The yarns are formed by twisting the hemp right-handed ; the strands, by twisting or laying up the yarns left-handed ; and the rope, by laying up the strands right-handed.

      Three ropes laid up left-handed form what is known as a cable-laid rope; four-stranded ropes are laid round a heart. Ropes are sometimes laid left-handed, but if the strands are to be laid left-handed the yarns are laid right-handed. If the parts of hemp, etc., be twisted more than is necessary to hold them together, strength is lost. Upon following the course of a yarn in a rope it will be found that, by this alternate laying, it runs nearly straight with the direction of the rope’s length.

      A three-stranded rope will bear a greater strain in comparison with its size than any other of the same material ; cable-laid ropes and four-stranded ropes are, roughly speaking, about one-fifth weaker. Rope is measured by its circumference, and is laid up in lengths of 113 fathoms, sizes varying up to 28 in. ; but it is not usually made up in coils when the size exceeds 5 in. Very small ropes are distinguished by their yarns rather than their size; thus sailors speak of nine-, twelve-, and eighteen-yarn stuff, which is commonly called seizing stuff.

      If the fibres of which a rope is composed were laid parallel to one another and fastened at the two ends, the combined strength of these fibres would be utilised to the full; in other words, they lose strength by being twisted or laid up. But, on the other hand, the length of the fibres being at most but a few feet, their usefulness in this state is very limited, and the inconvenience of using them so is prohibitive. For this reason the fibres are first twisted into yarns ; these, again, are laid up into strands, a strand being formed of several yarns ; and, finally, three or more strands are formed into a rope. As twisting diminishes the strength of a rope, it is important that the yarns be carefully laid up, so as to bring an even strain on every part. It should not be laid up too hard—that is, it should only have sufficient twist in it to prevent the fibres from being drawn out without breaking.

      Hawser-laid ropes are made of three strands laid right-handed, or with the sun, as it is termed. Shroud-laid are made of four strands laid right-handed. A cable-laid rope is made of three hawser-laid ropes laid up left-handed, and therefore contains nine strands. Obviously the size of a rope is regulated by the quantity of yarns composing the strands, and not by the number of strands that it contains.

      4 in. flat hemp rope will weigh about 2 x 7 = 14 lb. per fathom.

      4 in. = say 2 sq. in. area, will weigh about 10 x 2 = 20 lb. per fathom.

      ness of rope, nature of load, mode of lifting, etc Approximately, the safe load on a new hemp rope in hundredweights with direct lift is three times the weight in pounds per fathom. On a sound old rope fall one-half the square of the circumference is sufficient load. A Bessemer steel wire rope will safely carry in hundredweights three times the square of its circumference in inches, and a crucible steel wire rope four times the square of its circumference. For hemp ropes the minimum diameter of sheave should be circumference of rope + 2, and for wire ropes the diameter of sheave in inches should be equal to circumference of rope in sixteenths.

      The principle of rope making is very readily shown by holding the ends of a piece of twine or whipcord, about a foot long, in the hands and twisting it so as to increase the lay. If the twine be now slackened by bringing the hands nearer to one another, a loop will first form in the middle of the twine, and it will continue to twist itself up into a compact cord which will not unlay, as the tension to which the strands have been subjected causes friction between them, which holds them together. In other words, the tendency of each part singly to unlay, acting in opposite directions, is the means of keeping them together when joined.

      Some very interesting experiments were made by Réaumur, the purposes of which were to ascertain the loss of strength occasioned by laying up the fibres of various substances, one or two of which are given.

      1. A thread, consisting of 832 fibres of silk, each of which carried 1 dram and 18 grains, broke with a weight of 5 lbs., though the sum of the absolute strength of the fibres is 104 drams, or upwards of 8 lbs. 2 oz.

      lbs., whereas they should have carried 24 lbs.

      These experiments prove that though convenience and portability are gained by twisting the fibres, there is a great loss in the strength of the resultant rope.

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