ROPE-MAKING. 



Table IX. 



Shewing the Length of Yarn required to be warped, and the different fhrinking Proportions 

 in making the undermentioned Lengths of four-ftrand cable-laid Cordage. 



N.B. The fhrinking proportions of four-ftrand cable-laid 

 cordage is exaftly the fame as three-ftrand, except in clofing 

 the cable, which confiding of four ftrands, lie much 

 clofer in the rope than thref llrands, but not having a heart 

 to encompafs it, does not diminifh in length fo much as 

 cable-laid ftays. The cable in clofing will fhorten Vx°3- parts 

 of the length of yarn fir Jt warped. 



It being rather unufual to lay cables with a greater num- 

 ber of llrands than four, the above tables are not laid down 

 for a greater proportion, — but to know how to find the 

 number of threads to work per hook for a greater number 

 may at fome time be necefiary, therefore the following me- 



thod mull be purfued to lay a cable in as many llrands at 

 may be thought expedient. Suppofe a five-llrand cable-laid 

 rope is wanted to be made, you iirit fquare the fize 

 of the rope propofed to be made, and multiply that pro- 

 duel: by the fize yarn you mean to make your cable from, 

 that product divide by 52, and the quotient will be the 

 number of threads to work per hook for a five-ftrand 

 cable-laid rope. If for a fix-llrand, proceed as before, 

 and divide by 62 ; for a feven-ftrand, divide by 72 ; for an 

 eight-ftrand, divide by 82 ; and fo on, adding 10 to your 

 divifor for every ftrand you mean to increafe in number in 

 your cable. 



Table X. 



Shewing the Prime Coft to the Manufacturer in each Procefs, in making the undermentioned Sizes of 

 three-ftrand cable-laid Cordage, with the Weight of Hemp and Tar required for each Rope. 



The above table is calculated according to the ufual 

 mode of rope-making, and is termed by the trade work- 

 ing by the fquare, which is performed in the following 

 manner : Suppofe a cable 15 inches in circumference, 

 the fquare of 15 is 225, the half of which is 112/.; 

 that is, 113 threads per hook mull be laid up for 

 a 15-inch cable, proceeding in the fame manner for 

 any iize demanded, which mode of working anfwers to 



lis teen-thread yarn in all fizes of three-ftrand cable-laid 

 cordage. 



Where the diameter and circumference of one rope to an- 

 other is as 2 to 1, that is, where one rope is twice as big as 

 another, the fquare of the diameter is as 4 to I, which 

 (hews that one rope has four tun .1, much yarn in it as the 

 other, and confequently is four times as ftrong, according 

 to the different magnitudes. 



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