One of the oldest technologies, and one of the least preserved
Rope is easy to overlook because it rots. Plant fibers do not survive well in most soils, so direct evidence is thin compared with stone or pottery. What is known comes from rare finds in dry or waterlogged sites, impressions left in clay, tomb paintings and written descriptions. An impression of twisted cord found in a cave in France has been dated to many thousands of years ago, and cord impressions on pottery are common in many regions, which shows that cordage was widespread long before cities.
Because the evidence is scattered, it is not possible to name a single inventor or place. The technique is simple enough that it was probably discovered many times.
Why twisting works
A single plant fiber is short and weak. Twist many together, though, and friction between the fibers locks them in place, so the cord holds as a whole even though no individual fiber runs its full length. This is the central idea behind almost all natural-fiber cordage.
The usual process has three stages.
- Yarn. Fibers are drawn out and twisted in one direction, say clockwise, into a thin yarn.
- Strands. Several yarns are twisted together, typically in the opposite direction, forming a strand.
- Rope. Several strands are twisted again in the direction of the first twist, producing the finished rope.
Each stage alternates direction. That is not decoration. The opposing twists balance each other, so the rope holds together under load instead of untwisting. Rope made this way is often called laid rope.
Materials
The choice of fiber depended on what grew nearby.
- Flax and hemp gave strong, durable fibers and were common in Europe and Asia. Hemp became especially associated with ship rigging.
- Papyrus was used in Egypt, as was palm fiber.
- Coir, from coconut husk, resists salt water and was common around the Indian Ocean.
- Sisal and manila came into wide use for rope later, from the nineteenth century on.
- Leather, sinew and grass appear in many cultures for specific purposes.
Each material differs in strength, stretch, rot resistance and how it behaves when wet. A rope’s strength also depends on the quality of the twist and the care taken in making it.
Ancient rope in practice
Egyptian tomb paintings and reliefs show workers making rope, sometimes with one person twisting while others walk backward, feeding out fibers. Written and pictorial evidence indicates that rope was used to drag heavy stones on sledges, raise loads, secure ships, work irrigation devices and bind timber. Historians generally agree that large building projects of the ancient world depended on rope, though the exact methods used for specific monuments are still debated and rarely documented.
Rope was also vital in warfare, for siege engines, bowstrings and catapults. Some ancient torsion engines were powered by tightly twisted bundles of sinew or hair, which acted like springs, a related use of twisted cordage.
Ropewalks
Making long ropes by hand posed a problem of space. A rope has to be laid out in one piece, so a rope of length 200 meters needs a clear path longer than that. The solution was a ropewalk, a very long, narrow building or covered path, where rope makers walked backward while paying out fibers from a bundle around the waist and twisting them as they went.
By the early modern period, large ropewalks served shipyards, especially naval dockyards, where the demand for rigging was heavy. The largest ran for roughly a quarter of a mile. A typical operation divided the work among spinners, who made the yarns, and others who formed strands and laid them into finished rope. The process was slow and physically demanding, and fire was a recurrent danger, since hemp and tar burned readily.
Mechanization came gradually. Machines for spinning yarn and laying rope appeared in the late eighteenth and nineteenth centuries, which cut the labor needed and allowed more consistent rope. By then, the metal wire used for cables and wire drawing was also providing alternatives for certain tasks.
Rope and the sailing ship
Rope has a special place in the history of sailing ships. A square-rigged vessel could carry many kilometers of cordage, called rigging, to hold masts in place (standing rigging) and to raise, lower and trim sails (running rigging). Anchor cables, mooring lines and tow lines were all heavy rope. Because wet hemp rope rots, it was often treated with tar, which protected it but added weight.
The reliance on rope shaped the work of sailors, who needed to splice, knot, whip and repair it constantly. Many sailing terms still in use today come from this.
Rope in building
On land, rope appears wherever a load must be lifted or held. Cranes powered by treadwheels, simple pulleys and windlasses all rely on cordage. Scaffolding was lashed together with rope in many regions and still is in some. Builders also used lines and plumb bobs to set out foundations and keep walls straight, and a stretched cord served as a straight edge long before modern measuring tools.
Limits and later change
Natural-fiber rope has limits. It stretches, rots, can fail without obvious warning when worn, and its strength varies with the batch. Steel wire rope in the nineteenth century, and later synthetic fibers, replaced it in many demanding uses. Even so, the basic principle of twisting short fibers into long, strong cords has not changed.