328 SUBMARINE CABLE LAYING AND REPAIRING. 



and picking-up, has a single drum driven by a double-cylinder 

 engine with inclined cylinders, fitted with clutch for single or 

 double purchase, and a brake for paying-out with the engine 

 thrown out of gear. The brake is controlled by a hand-wheel 

 and screw. The aft gear is driven by a similar engine with 

 clutch for throwing out of gear when paying-out with the 

 brake. The bow and stern sheaves are fitted underneath the 

 working deck or platform, as in the "Faraday." The testing 

 room is situated underneath the forward part of the bridge. 

 Lord Kelvin's sounding air-tube navigational machine and 

 James's submarine sentry for indicating depths while in motion 

 are carried, and the ship is also supplied with Messrs. Johnson 

 and Phillips' sounding machine for deep-sea work. 



For trimming purposes the " Mackay-Bennett " is built with 

 a special cellular double bottom running the whole length of 

 the vessel, which can be utilised for water ballast to the extent 

 of 300 tons. 



The equipment of this handsome vessel is completed with an 

 electric lighting plant consisting of two Siemens dynamos, each 

 with a normal output of 90 amperes at 110 volts. These are 

 driven by a pair of Tangye engines, the light being distributed 

 throughout the ship, and night operations are facilitated by 

 deck-light reflectors fitted with six and eight incandescent 

 lamps. 



The Gable Ship " Retriever."— This vessel (Fig. 193), be- 

 longing to the West Coast of America Telegraph Company, and 

 stationed at Callao, Peru, attracted public notice during the 

 Chilian revolution of 1891, when the cables of this Company 

 connecting the principal ports of Chill were cut and interfered 

 with by war-vessels of both parties. She was built on the 

 Clyde in 1878, and passed her third survey under the regula- 

 tions of Lloyd's Committee in 1891. Her principal dimensions 

 are 180ft. by 30ft. by 16ft. deep ; gross tonnage 775, and 

 horse-power 95. She carries two tanks, each of 26ft. diameter 

 and 7ft. deep, having, therefore, a capacity of 200 nauts of 

 deep-sea cable. The Company's system of cables kept in 

 repair by this vessel runs from Chorillos, near to Callao and 

 Lima (Peru), down to Valparaiso in Chili, touching at the 

 intermediate ports of Mollendo, Arica, Iquique, Antofagasta, 



