WIRE ROPE 



273 



" expedition " rather than a yachting cruise, but for 

 work to 2,500 fathoms the following combination may 

 be suggested : 1,500 fathoms of i-inch rope at the 

 trawl end, 1,000 fathoms of ij-inch, and 500 fathoms 

 of ij-inch at the winch end, all shackled together ;* 



Fig. 194. — Section of Wire Rope. (By Permission of 

 Messrs. Bullivant.) 



a special shackle is made for this work. The object 

 of this combination is to strengthen the rope where the 

 heaviest strain comes, and the total result is as follows, 

 taking ropes d, e,foi the list on p. 272 as types : 



Weight. 



Breaking 



-Strain. 





ton. 



cwt. 



tons. 



cwt. 



At sheave 



I 



17 



8 



O 



Above first shackle 



I 



7 



8 



O 



Below „ 



I 



7 



4 



14 



Above second shackle . . 



O 



13 



4 



M 



Below 



O 



13 



3 



II 



Whether the rope be stored on the winch-barrel or 

 on a separate reel, it should be carefully and evenly 

 spread as it comes in. In hauling heavy gear, especi- 

 ally where the warp is wound directly under consider- 



* Owing to the shackles (or splices) such a rope could not be 

 used below 1,500 fathoms for closing- nets or similar apparatus 

 worked by messengers. 



iS 



