240 SUBMARINE CABLE LAYING AND REPAIRING. 



or for a height of say 5ft., 4-7 x 5 = say 23 nauts, or for the two 

 tanks 46 nauts of Type B. 



The forward tank is 14ft. diameter by 7ft. 6in. deep. Allow- 

 ing 4ft. for cone, the net coiling space in this tank per foot 

 height would be 



(142 _ 42) -7854 = 141 cubic ft. 



Supposing this tank loaded with shore-end Type A to a height 

 of 5ft., it would hold 



X 5 — 4-7 nauts. 



150 



The ship would therefore carry in 



No. 1 Tank about 5 nauts Type A. 



or altogether about 200 nautical miles of these particular type 

 of cable, or 290 nauts if entirely loaded with deep-sea cable, to 

 the above-named heights. 



Fig. 139. — Feather-edge in Coiling. 



The cable is coiled from the outside of the tank inwards, and 

 when the innermost turn of one flake is laid next the cone the 

 cable is taken straight across over this flake to the outside to 

 commence coiling the next. The part so taken across and lying 

 between each flake is called the "lay-out," and in Fig. 139 is 

 shown in section by the small circle. The feather-edge is made 

 with strips of deal wood about five or six feet long, and cut with 

 a wedge-shape section, as shown, so as to pack up the lay-out 

 and form a gradual rise and fall for the turns of the upper flake 

 as they cross it. 



In picking up during repairs the lengths coiled in tank 

 generally only occupy a few flakes, and it is often desirable to 

 know the length of cable per flake for different types, as coiled 

 in each of the tanks. This may be observed, as the cable is 

 being coiled, by the indications of the rotometer, but is also 



