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MARLINESPIKE SEAMANSHIP - 12018_233
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Basic Military Requirements (BMR) - Requirement for military advancement
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along a line, the twist is to the right. During construction of natural fiber line, a lubricant is added that also serves as a preservative. Large line  is measured by circumference. Line 1 3/4 inches and under in circumference, called   small stuff, is identified by the number of threads in the line. A line  with  twenty-four  thread  is  1  1/2  inches  in circumference. Inasmuch as the numbers of threads per strand are equal, thread numbers in a three-strand line are divisible by 3—24, 21, 18, and so on, down to the smallest—6 thread (3/4 inch). Line from 1 3/4 inches to about 4 inches is manufactured in 1/4-inch graduations. The length of all line and wire rope is usually measured in feet. The chart shown below lists tips on the care of natural fiber line. You should be thoroughly familiar with them and observe them at all times. NYLON LINE Most of the tips for the care of natural fiber line should be observed with nylon line. Nylon, however, is not  subject  to  mildew.  It  should  be  scrubbed  if  it becomes slippery because of oil or grease. A stretch of one third of its length is normal for nylon line under safe working loads. Nylon stretches about 50 percent before it will break. Because of its elasticity, nylon line breaks with a decided snapback; therefore, stand well clear when it is under a heavy strain. 7-13 Student Notes: NEVER ALWAYS Stow wet or damp line in an unventilated compartment or cover it so that it cannot dry. Mildew will form and weaken the fibers. Dry line before stowing it. Subject line to intense heat nor unnecessarily allow it to lie in the hot sun. The lubricant (natural oils) will dry out, thus shortening the useful life of the line. Protect line from weather when possible. Subject a line to loads exceeding its safe working load. To do so may not break the line, but individual fibers will break, reducing the strength. Use chafing gear (canvas, short lengths of old firehose, and so on) where line (or wire) runs over sharp edges or rough surfaces. Allow line to bear on sharp edges or run over rough surfaces. The line will be cut or worn, reducing the strength and useful life. Slack off taut lines when it rains. Wet line shrinks, and if the line is taut, the resulting strain may be enough to break some of the fibers. Scrub line. The lubricant will be washed away, and caustics in strong soap may harm the fibers. Coil right-laid line to the right (clockwise). Put a strain on a line with a kink in it. Inspect a line before using it. Overworked or overstrained line will have a bristly surface. Mildew can be seen, and it has peculiar, unpleasant odor. Untwist the line so that the inner parts of the strands can be seen. If they have a dull, grayish look, the line is unsafe. Try to lubricate line. The lubricant you add may do more harm than good. Give line the care it deserves—someday your safety may depend on it.







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