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: Cargo’: Hola SO ry r pase! Pe choketatte be Cargo: Hold 1 TOOTS TAT NTT AT O a a _{14‘0" WL. Upper Deck OUTBOARD PROFILE AND DECK PLAN OF THE STEEL ELECTRICIAN cut engine room with easy access to all parts of the machinery. The main generators, exciters, and. propelling motor are of the open, self- ventilated type, but are fitted with sheet steel covers to protect from dripping or mechanical injury. The main generators and propelling motor are straight shunt wound machines, connected in series and arranged for the full voltage control system, which the Westinghouse company has used on the vessels it has equipped with diesel-electric drive. A very simple potentiometer type rheostat is used for varying the generator field excitation in 50 steps from zero to full value in either direction. The motor field is excited at constant value and in one direction. Under this condition, a variation in the generator excitation will pro- duce a like variation in the motor speed, and hence the propeller speed. Complete control of the propeller is, therefore, effected from the pilot house by handling only the small’ field cur- - rent of the generators and without opening a circuit of any kind. The potentiometer rheostat is mounted just beneath the pilot house floor and is operated, through bevel gears and shafting from a control pedestal, simi- lar to a standard engine room tele- graph stand, located in the pilot house alongside the steering control stand. A duplicate control station is provided at the switchboard in the engine room for emergency use. Complete con- trol may be instantly transferred from one station to the other by manipulation of a switch on the main switchboard. As shown in the accompanying illustrations, the main switchboard is arranged in six panels. The three panels on the port side control the connection set-ups for the main gen- erators, and are of the complete dead- front type. Each generator is pro- vided with a 3-position switch, man- ually operated by means of a hand wheel on the front of the panel. The hand wheel is provided with a notched disk so that the switch may be latched in any one of the three positions. Each latch handle carries an inter- lock which opens the excitation circuit to the generator and motor fields whenever the latch is disengaged from the notch, thus assuring that the main circuit is de-energized whenever switching operations are made. One position of the switch connects the generator in the series propulsion circuit. The second position on the switch connects the generator to the auxiliary bus for supplying the cargo- handling machinery. The third posi- PROPELLING MOTOR AND ENGINE ROOM LOOKING FORWARD ON THE STEEL ELEC- TRICIAN. <A 750-HORSEPOWER AT 135 REVOLUTIONS PER MINUTE DIRECT CURRENT MOTOR—CURRENT FURNISHED BY THREE 300-HORSEPOWER EACH AT 225 REVOLUTIONS PER MINUTE DIESEL ENGINES MARINE REVIEW—June, 1927 25