2. The operations of rope-making are commonly performed in rope-walks, which are sometimes more than a quarter of a mile in length. These are usually covered with a slight shed, the nature and appearance of which are well exhibited in the preceding picture.
3. The first part of the process consists in spinning the material into yarn. The principle on which this is effected, is the same as that by which cotton or wool is drawn out and twisted into threads, although the machinery, and the mode of operating, are different.
4. The kind of wheel employed in spinning rope-yarn, is also exhibited in the cut. A band passes around the periphery, and over the semicircle above it, in which is placed a number of wheels, the pivots of which terminate, on the other side, in a small hook.
5. The spinner, having a quantity of the material properly disposed about the waist, attaches a number of fibres to one of the hooks, which, being put in motion by the band passing over the whirl, twists them rapidly into yarn. The part already twisted draws along with it more fibres from the bundle, and, as the spinner is regulating their uniform arrangement, he walks backward towards the other end of the walk.
6. When the thread has been spun to the proposed length, the spinner cries out to another, who immediately takes it off from the hook, gives it to a third person, and, in turn, attaches his own fibres to the same hook. In the meantime, the first spinner keeps fast hold of the end of his yarn, to prevent it from untwisting or doubling; and, as it is wound on the reel, proceeds up the walk, keeping the yarn of an equal tension throughout.
7. The second part of the process consists in forming the yarn into various kinds of ropes. The component parts of cordage are called strands; and the operation of uniting them with a permanent twist, is called laying, when applied to small ropes, and closing, when applied to cables or other large ropes.
8. The simplest twist is formed of two strands. The thread used by sail-makers, and pack-thread, furnish examples of this kind; but cordage with two strands is not much used; that with three is the most usual. Lines and cords less than one and a half inches in circumference, are laid by means of the spinning-wheel. Preparatory to this operation, the workman fastens the hither end of the yarns to separate whirl-hooks, and the remote ends to the hook of a swivel, called the loper.
9. The strands having been properly distended, the spinning-wheel is turned in the same direction as when twisting the yarns. A further twisting of the strands, during this part of the process, is prevented by the motion of the loper, which gives way to the strain, and, at the same time, causes the strands to entwine about each other, and form a cord. To prevent them from entwining too rapidly, an instrument is interposed, which, from its form, is called the top. It has two or more notches, which terminate at the apex, and a handle, called a staff. As the top is moved from the loper to the wheel, it regulates the degree of twist which the cord or rope is to receive.
10. The principle on which large cordage is laid, or closed, is the same, although some part of the machinery is different. The strands for large ropes and cables are formed of many yarns, and require considerable hardening. This cannot be done with whirls driven by a wheel-band; it requires the power of a crank, turned by hand, or by some other considerable force. The strands, also, when properly hardened, become very stiff, and, when bent round the top, cannot transmit force enough to close the unpliant rope: it is, therefore, necessary that the loper, also, be moved by a crank.
11. Cordage, which is to be exposed to the alternate action of air and water, is usually tarred. The application of this substance is made, in most cases, while the material is in a state of yarn. In effecting this object, the threads are drawn through boiling tar, and then passed between rollers, or through holes surrounded with oakum, to remove the superfluous tar. In like manner, ropes and cables are superficially tarred.