ROPE-MAKING. 



cordage, you mufl work with (in addition to your fledge) 

 one prefs-barrel to every 20 threads contained in your ftrand ; 

 but in laying the ftrand, hardening, and laying the cable, 

 you muft have only one prefs-barrel to every 40 threads con- 

 tained in your ftrand or cable. The above is to be confidered 

 as a ftanding rule in covered rope-grounds, but in open 

 grounds, the prefs muft be varied according to the ftate of 



the bottom of the ground, which, after a fhower of rain, or 

 in damp weather, will be naturally foft, and occafion the 

 fledge to draw exceedingly heavy, and of courfe want the 

 lefs weight of prefs. 



N. B. The weight of a prefs-barrel fhould be from 3^ to 

 4 cwt. 



Table III. 



Shewing the different fhrinking Proportions of the Yarns and Strands in each Procefs in making the undermentioned 



Lengths of Cable. 



Length in 

 fathoms of 

 cable. 



Length 



of yarns 



required to 



be warped. 



I 



In hardening the ftrands, 

 the yarn will (hrink 1 -5th 

 part of the whole length 

 warped, and is called the 

 brand's hardening mark. 



In laying the ftrands, 

 the ftrand will fhrink 

 l-10th part of the whole 

 length warped, and is 

 called the ftiand's going 

 diftance. 



In hardening the cable- 

 ftrauds previous to laying 

 the cable, the ftrands 

 will ihriiik i-30th pan 

 of the whole length 

 warped, and is called the 

 cable's hardening mark. 



In laying the cable itwill 



ihrinkl-1 5th part of the 



whole length warped, 



which brings it to the 



length required. 



The Sledge mould move up to the following Diftances from the Tackle-Pofts. 



Cable 



Whole 



fms. 



40 

 60 



80 

 120 



Table IV. 

 Shewing the Weights of three-ftrand cable-laid Cordage. 



It is neceffarv to be underftood, that in rope-making 

 (according to the nature of the rope I, weight will give fize, 

 and fize will give weight, if properly made. 



Rule. — To calculate very nearly the weight of any fizcd 

 rope from 3 to 24 inches in circumference, 1 20 fathoms long, 

 and lefler lengths in proportion ; as may be readily proved by 

 the above table, viz. multiply the fize of the rope by itfelf, 

 and one-fourth of that product is the weight of a hundred of 

 112 pounds. 



Example. — Suppofe the rope 12 inches in circumference; 

 12 x 12:: 144, the fourth of which is 36 hundred weight, or 

 3732 pounds, the weight of 120 fathoms of rope 12 inches 

 in circumference. Again, 40 fathoms is the third of 120 

 fathoms ; and the third of 36 cwt. is 12 cwt. the weight of 

 40 fathoms of 1 2-inch cable, as above. 



Directions boiv to apply the following Tables. 



In which is confidered the four moft principal forts of 

 yarns made ufe of in cable-laid cordage, viz, 16, 18, 20, 

 and 25-thrcad yarn, and in hawfer-laid cordage, to the 

 three principal forts of yarn made ufe of, viz. 18, 20, and 

 25-thread yarn, as it is very feldom any Other fize yarn is 

 made for either cable or hawfer-laid rope, except very par- 

 ticularly ordered to the contrary. The particulars of every 

 rope of the fizes mentioned in the tables are fully explained 



1 



to the length of twenty fathoms, which will be found 

 quite a fufficient guide for a rope of any length required : 



jisfor Example. — Suppofe I want a taper cable-laid rope 

 to be made out of 16-thread yarn, 60 fathoms long, and 

 6 inches in circumference, to be tapered ;ds the length, 

 and Jds the fize of the rope. I refer to Table V., and 

 find under the figure 6, (the fize demanded,) that it muft be 

 worked 5 threads per hook in the (hank, the length of yarn 

 to be warped for which, for 20 fathoms (I find in the margin) 

 requires to be 33 fathoms 2 feet, three times which is too 

 fathoms, the length of yarn required to be warped for the 

 (hank of a rope of 60 fathoms long. I then obferve, in the 

 next column on the right in the margin, the length of yarn 

 required in the head for 20 fathoms is 1 1 fathoms o feet 

 8 inches, three times which is 33 fathoms 2 feet, the length 

 of yarn required in the head to the liiil taper for a rope of 

 60 fathoms. Next refer to the number of tapers to be 

 worked, which, upon looking under the figure 6, (the fize 

 demanded,) I find to be 9, the diftance between them I find 

 (upon calling my eye down the column) to be 14 feet 7^ 

 inches for 20 fathoms, three times which 1 44 Feet 5,- 

 inchea, the diltancc to be obferved between the tapers for a 

 rope of 60 fathoms, being the lengl h demanded. The fame 

 rule is be obferved, either adding or multiplying, according 

 as required in all the tables of a funilar defcription. 



Table 



