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Encyclopedia Britannica - Main :: SAC-SAR |
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SAILCLOTH , now more commonly called canvas (q.v.). usually a double
threads of warp. Hemp and ramie are occasionally used in the manufacture of this cloth, but flax and cotton
chief
The very best kind of sailcloth is made from long flax, as this fibre possesses flexibility, lightness and strength combined. The number of threads per inch of warp varies from 14 double
Cotton
Great
weight
weight
Canvas is made in sixteen different qualities: the heaviest is No. 0000, then follow Nos. 000, oo, o, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, II and 12. Of these sixteen varieties Nos. 1 to 8 are mostly in use. Nos. 1, 2, 4, 6 and 7 are used for royal navy canvas, and Nos. 4 and 6 for the merchant navy. The canvas for the Admiralty is 24 in. wide, and the pieces, termed bolts, should be as nearly as practicable 40 yds. of legal measure in length, and to be completely manufacturedparticular attention being given to the weaving; the selvages to be evenly and well manufactured, the thrum to be left on each end of the bolt, and to be made as nearly as possible in the proportion of weights given below. The breaking tests for red and grey canvas are 5 % below those for white canvas. Sailmaking is a very ancient industry, but it is, naturally, much less important than It was before the introduction of steamships. The operations of the sailmaker may be stated as follows. The dimensions of mast and yards and sail plan being supplied, the master sailmaker is enabled to determine the dimensions of each sailafter due allowance for stretchingin terms of cloths and depth in yardsif a square sail, the number of cloths in the head, number in the foot and the depth in yards; if a fore-and-aft sail (triangular), the number of cloths, in the foot and the depth in yards of the luff or stay and of leech or after-leech;if a fore-and-aft sail (trapezium form), the number of cloths in the head, number in foot, and the depth of mast or luff and of after-leech. These particulars obtained, there is got out what is technically termed a " casting," which simply means the shape, length, &c., of each individual cloth in the sail. These figures are given to the cutter, who proceeds to cut out the sail cloth by cloth in consecutive order, numbering them 1, 2, 3, 4, &c.; the series of cloths thus cut out are handed over to the workman, who joins them together by care-fully made double flat seams, sewn with twine specially prepared for the purpose, with about 120 stitches in a yard. In the heavysails the seam is about 12 in. in width, and in the British navy stuck or stitched in the middle of the seam to give additional strength; the seams in the lighter sails are about I in. wide. The whole of the cloths are then brought together, and spread out, and the tabling (or hemming, so to speak) is turned in and finished off with about 72 Canvas Weight Weight Length No. of Breaking Breaking Dimensions Number. of Warp. of Bolt. of Bolt. Reed. Threads. Test for Test for of Testing Warp. Weft. Strip. lb. lb. yds. Score. Double. lb. lb. in. 1 26 46 39 16a 66o 340 48o 24 XI 2 24 43 39 16a 66o 320 46o 24 XI 3 22 40 39 16 + 66o 300 440 24 X I 4 21 36 39 17 68o 28o 400 24 XI 5 19 33 39 17 68o 260 370 24 XI 6 18 30 39 17 68o 250 350 24 XI 7 15 27 40 20 800 single 330 390 24X1+ 8 14 23 40 20 800 310 38o 24X1+ stitches to a yard. Strengthening pieces or "linings " are affixed where considered necessary, in courses and top-sails such pieces as reef-bands, middle-bands, foot-bands, leech-linings, bunt-line cloths; in top-sails (only) a top-lining or brim; in other and lighter sails such pieces as mast-lining clew and head, tack and corner pieces; holes, such as head, reef, stay (luff), mast, cringle, bunt-line, &c., are also made where required, a grommet of line of suitable size being worked in them to prevent their being cut through. The next thing to be done is to secure the edges of the sail. Bolt-rope, a comparatively soft laid rope made from the finer hemp yarn (Italian) is used for this purpose; in the British navy it ranges from i in. (increasing in size by quarter inches) up to 8 in. inclusive; it is then neatly sewn on with roping twine specially prepared, the needle and twine passing between and clear of every two strands of the rope in roping. Where slack sail has to be taken in, it is the practice to leave it to the judgment of the sail-maker; but where possible it is better to set up the rope by means of a tackle to a strain approximate to what it will have to hear when in use, and whilst on the stretch mark it off in yards, as also the edge of the sail in yards, so that by bringing the marks together in roping the sail will stand flat. In the British navy the largest size of rope sewn on to a sail is 6 in; sizes above this are used for foot and clew ropes of top-sails and courses, being first wormed, parcelled (that is, wound round with strips of worn canvas), tarred and served over with spun yarn; the foot of the sail is then secured to it by being marled in. Where two sizes of bolt-rope used in roping a sail have to be connected, it is effected by a tapered splice. Cringles (similar to the handle of a maund) formed by a strand of bolt-rope, mostly having a galvanized iron thimble in them as a protection, are then stuck where necessary, as at the corners, sides or leeches, mast or luff; they are required either for making stationary or hauling " taut " by tackle or otherwise certain parts of the sail when in use. Fore-and-aft sails, such as spankers, gaff-sails and storm
crow -footed in the middle, a hole being pierced through every seam; one-half of the point is passed through and the crowfoot sewn firmly to the sail; the number of reefs depends upon the size of the sail, and the reefs are placed parallel to the foot. The sailsnow finished in respect of makinghave to be fitted, that is, such ropes have to be attached to each of them as are necessary for proper use; such ropes may be summarily stated as follows: head-earings, robands, reef-earings, reef-lines, spilling and slab lines, reef-tackle pendant, reef-points, bow-line bridles, bunt-line toggles, bunt-becket, leech-line strops and toggles, toggles in clews, sheet ropes, down-haul, lacings, head and stay, tack-rope (gaff top-sail), tack lashing, bending strops, matting and gaskets.The tools and appliances of a sailmaker are not very numerous: a bench about 7 ft. long and 15 in. high, upon which he sits; palms for seaming and roping to fit the hand, made of hide lined with leather, a plate
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