Moby Dick and lines

When you sail, you learn about lines and knots. There's an extensive literature on these, and it's difficult to judge what's relevant, but one needs to figure it out. In this passage, Herman Melville makes every detail of the whale-line relevant to survival: the size, the material, the length, the tarring, the coiling etc.

From Moby Dick, Chapter 60: The Line.

The line originally used in the fishery was of the best hemp, slightly vapored with tar, not impregnated with it, as in the case of ordinary ropes; for while tar, as ordinarily used, makes the hemp more pliable to the rope-maker, and also renders the rope itself more convenient to the sailor for common ship use; yet, not only would the ordinary quantity too much stiffen the whale-line for the close coiling to which it must be subjected; but as most seamen are beginning to learn, tar in general by no means adds to the rope’s durability or strength, however much it may give it compactness and gloss.
...
The whale-line is only two thirds of an inch in thickness. At first sight, you would not think it so strong as it really is. By experiment its one and fifty yarns will each suspend a weight of one hundred and twenty pounds; so that the whole rope will bear a strain nearly equal to three tons. In length, the common sperm whale-line measures something over two hundred fathoms. Towards the stern of the boat it is spirally coiled away in the tub, not like the worm-pipe of a still though, but so as to form one round, cheese-shaped mass of densely bedded “sheaves,” or layers of concentric spiralizations, without any hollow but the “heart,” or minute vertical tube formed at the axis of the cheese. As the least tangle or kink in the coiling would, in running out, infallibly take somebody’s arm, leg, or entire body off, the utmost precaution is used in stowing the line in its tub. Some harpooneers will consume almost an entire morning in this business, carrying the line high aloft and then reeving it downwards through a block towards the tub, so as in the act of coiling to free it from all possible wrinkles and twists.