TYPES OF LAYS OF LINE

There are three types of lays of fiber line with which you should be familiar. They are the HAWSER-LAID, SHROUD-LAID, and CABLELAID lines. Each type is shown in figure 4-2.

Hawser-Laid Line

Hawser-laid line generally consists of three strands twisted together, usually in a right-hand direction.

Shroud-Laid Line

Ordinarily, a shroud-hid line is composed of four strands twisted together in a right-hand direction around a center strand or core. This core is usually of the same material but smaller in diameter than the four strands. You will find that shroud-laid line is more pliable and stronger than hawser-laid line. You will also find that shroud-laid line has a strong tendency to kink. In most instances, it is used on sheaves and drums. This not only prevents kinking but also makes use of its pliability and strength.

Figure 4-2.-Lays of line.

Cable-Laid Line

Cable-laid line usually consists of three right-hand hawser-laid lines twisted together in a left-hand direction. This type is especially useful in heavy construction work, because if it tends to untwist, it will tighten any regular right-hand screw connection to which it may be attached; hence, its use provides an added safety feature.

SIZE DESIGNATION OF LINE

The size of a line larger than 1 3/4 inches (44.5 mm) in circumference is generally designated by its circumference in inches. A 6-inch (15-cm) manila line, for instance, would be constructed of manila fibers and measure 6 inches (15 cm) in circumference. Line is available up to 16 inches (40 cm) in circumference, but 12 inches (30 cm) is normally the largest line carried in stock. Anything larger is used only on special jobs (fig. 4-3).

Line 1 3/4 inches (44.5 mm) or less in circumference is called SMALL STUFF, and size is usually designated b y the number of threads (or yarns) that make up each strand. You may find 6- to 24-thread small stuff, but the most common sizes are 9- to 21-thread (fig. 4-3). You may hear some small stuff designated by name without reference to size. One such type is MARLINE-a tarred, two-strand, left-laid hemp. Marline is the small stuff you used the most for seizing. When you need something stronger than marline, use a tarred, three-strand, left-laid hemp, called HOUSELINE.

Figure 4-3.-Size designation of line.

If you ever order line, you may find that you have to order it by diameter. The catalog may also use the term rope (rather than line).

ROPE YARNS for temporary seizings, whippings, and lashings are pulled from large strands of old line that has outlived its usefulness. Pull your yarn from the middle, away from the ends, or it will get fouled.

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