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August, 1912 is to be equipped with electric pro- pelling- machinery designed by W. L. R. Emmet and built by the Gen- eral Electric Co. The' generating unit consists of a 6-stage Curtis tur- bine connected to a bipolar alternator, the speed of this unit at 14 knots being about 2,000: Ry PL Nh and the voltage about 2,200. unit delivers: velectricify cior. two motors, one mounted directly upon each propeller shaft. These motors have 36 poles, therefore the ratio of synchronous speed reduction is 18 to 1, the. propellers at 14 knots be- designed: to. operate at 110 R. This generating ing THE MARINE REVIEW Sheet metal ducts will be connected to their air outlets in such a manner that the. heated air will be led to the suction of the fire room blowers so that it will not be released in the engine room. Safety Interlocks Since in such an equipment it is only necessary to make such electric- ity as is required for the actual driv- ing. of the Ship; it is) possible te oe design the equipment that the maxi- mum power which can be delivered by the generator is not greatly in excess of that of the regular requirements, and 249 by the field circuit of the generator. These locks prevent the movement of these levers until the generator has lost its field, and thus prevent any pos- sibility of burning of contacts through movements at the wrong time or in the improper manner. Speed Control The speed of the motors in this ves- sel will be changed by variations in the speed of the generating unit, the ratio of speed reduction remaining fixed. The changes of speed, however, are not made by throttling as is usual with ship turbines. The turbine is Type 1-36-2,750-110-2,300 Voit Morors, P.M. : in-addition to. this apparatus there is a. switchboard equipment which provides oil switches for con- 'necting the motors for either direc- tien of rotation and _ instruments which show and record the electric power delivered to the motors. There are also two water-cooled resistance devices which are put in circuit with the revolving part of the motors in the process of reversing. Connections for the insertion of these resistances are made by sliders on the motor shafts operated by levers attached to the motor frames. The generating unit and motors are self-lubricating and __ self-ventilating. this fact, practically overcomes the pos- sibility of destructive trouble through wrong connections. It has, however, been thought desirable to arrange in- terlocks in such a manner that wrong connections cannot be made, the condi- tions being such that these interlocks involve no complication or uncertainty. Provision is thus made by which the go ahead switch and reversing switch can- not be closed at the same time and by which neither switch can be closed un- less the resistance is in circuit with the motor secondary. For the levers which operate the connection and dis- connection of the resistance, magnetic locks are attached which are energized Uniten States CoLLier JUPITER equipped with a governor of novel cor struction which is so arranged that it is capable of automatically holding the speed at any point from about 5 knots up tothe maximum. The setting of this governor is accomplished by the move- ment of a fulcrum which is controlled from a point near the switchboard and operating levers. Thus the operating engineer, without changing his position, can run the vessel at any desired speed ahead or astern, can stop and start, and from his instruments can see the speed and amount of power delivered to. each propeller. When the apparatus is: installed in the ship, arrangements will also be made by which in the same po-