BATTLESHIPS. EXPERIENCE GAINED ON THE JUPITER. 191 



The main propelling machinery consists of a nine-stage Curtis turbine, a two- 

 pole, three-phase AC generator, two 36-pole, three-phase induction motors, two 

 water-cooled rheostats, and one main switchboard. The following general dimen- 

 sions are given: — 



Turbo-Generator. 



Weight of bed plate 16.3 tons 



Length of bed plate 25 ft. 2j/^ ins. 



Length over all 27 ft. y%. ins. 



Height, extreme 9 ft. 534 ins. 



Turbine. 



Weight 28.7 tons 



R. P. M., normal 1,990 



Number of stages 9 



Number of rows of moving blades (two rows in first 



stage) 10 



Number of rows of fixed blades (first stage) i 



Minimum clearance .06 ins. 



Maximum clearance .18 ins. 



Generator. 



Weight 35.7 tons 



Number of poles 2 



Normal volts 2,300 



Normal amperes i,370 



Normal frequency 33.2 



Normal excitation 250 amperes 



Normal R. P. M 1990 



Rated capacity 5,450 kw. 



Rotor core length 60 ins. 



Air gap , ^ i^ ins. 



■I 



Motors. 



Number 2 



Weight (two) 76.8 tons 



Type, induction (definite wound rotor) "M" 



Number of poles 36 



Rated capacity 2,750 horse-power 



Normal R. P. M no 



Air gap .1 in. 



The excitation for the main generator is taken from one of the ship's 35-kw. gen- 

 erators. 



