THE PROPELLING MACHINERY OF THE U. S. S. LEVIATHAN. 219 



hot well tanks and reserve feed water tanks and discharge to the boilers, after 

 passing the water through surface feed heaters using auxiliary exhaust steam. 



Six vertical "Duplex" forced lubrication pumps supply oil to the turbine bear- 

 ings and thrusts. 



The two oil coolers are of the double-tube condenser type, the cooling water 

 passing outside the outer tube and internally through the inner tube, whilst the 

 heated oil passes in a film between the two tubes. 



In each aft engine-room is also arranged an auxiliary condenser having about 

 2,100 square feet of cooling surface, together with its circulating water pump 

 and monotype air pump. 



A large evaporating and distilling plant is located in a compartment on the port 

 side, outboard of the main turbine engine-room, and correspondingly on the star- 

 board side is the refrigeration machinery. 



The main electric lighting plant is arranged in a space aft of the two large 

 wing engine-rooms, and consists of five Brown-Boveri impulse wheel turbo-genera- 

 tors each rated at 445 kw., and 1 10 volts. This compartment forms a portion of the 

 tunnel for the two inboard lines of shafting and is about 30 feet wide and 66 feet 

 long. An emergency electric light plant, having a Diesel oil engine-driven generator, 

 is fitted well above the water-line and located close to the engineers' quarters. 



The tunnel shafts are hollow, about 18^ inches external diameter, and the tail 

 shafts 19^ inches external diameter. 



The two inboard lines of shafting are made up of nine lengths, which are sup- 

 ported by eighteen shaft bearings. 



The outboard lines of shafting each have three lengths, with six shaft bearings. 



The table on the following page gives the leading dimensions of the various 

 pumps. 



DETAILS OF THE TURBINES. 



High-Pressure Ahead {Port Inboard Shaft) . — The body of the casing is made 

 of cast steel, built in four sections, with a permanent vertical joint arranged between 

 the second and third expansion stages, whilst the two halves are bolted together at 

 flanges on the horizontal center line. 



Cast-iron pedestals are bolted on to facings at each end of the turbine body and 

 support the rotor bearings, adjusting block, supporting feet to the ship's founda- 

 tions and the columns of the lifting gear. 



The diameter of the rotor is about 8 feet 8 inches and is made up of three 

 separate forged steel drums which have internal flanges and are bolted together. 



The two end sections of the drum have other internal flanges at the end of 

 turned cylinders, into which are fitted the rotor end discs, and these are in turn se- 

 cured by through bolts. 



The overall length of the rotor drum, including dummy, is approximately 18 

 feet (Fig. 3, Plate 97). 



