. American engineer and railroad journal . ilar to the familiar street railway de-vice, except that instead of using a separate reversing lever,the handle moves in either direction from a central off few resistances required are also of the same form as usedin street car equipments. The circuit breaker serves thedouble purpose of a switch and a protection for the motor,preventing any possibility of disastrous short circuits orinjurious overloads. The electrical turntable possesses thefollowing important advantages: Simplicity of parts, low cost of maintenance and operation,can be ope
. American engineer and railroad journal . ilar to the familiar street railway de-vice, except that instead of using a separate reversing lever,the handle moves in either direction from a central off few resistances required are also of the same form as usedin street car equipments. The circuit breaker serves thedouble purpose of a switch and a protection for the motor,preventing any possibility of disastrous short circuits orinjurious overloads. The electrical turntable possesses thefollowing important advantages: Simplicity of parts, low cost of maintenance and operation,can be operated by an unskilled attendant, rapid accelerationup to comparatively high speeds, large reserve capacity formomentary overloads, perfect speed control, consumption ofpower only when in actual service. As intimated in the introductory paragraph, the time ele-ment is an extremely important consideration. With manualoperation it is difficult to attain more than one-third of thespeed of the electrical equipment. Tnis is due to the rapid ac-. FIG. 1. celeration of the electric motor, the high turning speed andthe ability to bring the turntable quickly to rest. At a certainbusy terminal, the roundhouse was recently rebuilt with pro-vision for twice the number of locomotives accommodated bythe original structure. The superintendent stated emphati-cally that this very desirable concentration of locomotives wasrendered possible only by operating the turntable electrically. The power for operating the turntable may be obtained fromthe direct current power circuit (125, 250 or 500 volts) of themachine shop, or may be purchased at a nominal meter ratefrom a local illuminating or power company. The use of elec-tric power has become so general that the conditions are veryexceptional where a separate generator would be required foroperating the turntable. Where a large number of engines must be handled expedi-tiously, a regular turntable operator should be employed and acab provided for his
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
