356 



SUBMARINE CABLE LAYING AND REPAIRING. 



about 25 per cent. For higher speeds for light cables It is best to 

 arrange a back gear by means of which the total reduction can 

 be changed over to 30:1. The same speed regulation is then 

 also available. This is better than obtaining the entire regula- 

 tion on the shunt, because in this work, especially when hauling 

 200 or 300 yards distance, stops and restarts are often necessary 

 to avoid kinking. The motor and machine are mounted together 

 on a substantial wrought-iron base-plate The starter, D.P. 

 switch and speed regulator are in enclosed iron cases fixed as 

 most convenient near the source of supply or carried on the 

 frame of the machine. The motor gear wheels are of cast-steel 

 with machine-cut teeth, and are protected by sheet-iron guards. 



Scale of Feet. 

 1 2 3 



Fig. 207. — 5 h.p. Motor driving Cable-hauling Gear. 



Shore-End Repairs. — When the fault or break is too near 

 shore for the ship to do the repair the work of lifting and 

 underrunning cable is done in boats. Large steamers carry a 

 steam-launch to assist in this work. A boat-raft is prepared 

 by making fast two lifeboats side by side. The lashing is 

 taken under the thwarts of each boat fore and aft and across 

 the gunwales at bows and stern, and then pulled up, Spanish 

 windlass fashion, at each end. A pair of timber baulks about 

 15ft. long are then prepared for carrying a running sheave at 

 the bows. The timbers are fixed so as to overhang the bows 

 about 5ft. and Inclined together at the outboard end. Inboard 



