. American engineer and railroad journal . -rent to the motor on the turntable, as follows: 1. By collector rings and brushes at the center of the turn- novembeb. 1902. AMERICAN ENGINEER AND RAILROAD JOURNAL. SS6 table 2. By trolley wires placed on the walls of the pit. 3. Byan overhead device with collector rings and brushes. The first method is by far the best, provided the design of thetable permits its use. The wires from the power house areled underground and up through the center-casting to station-ary collector rings. Attached to the turntable are brusheswhich collect the current from t
. American engineer and railroad journal . -rent to the motor on the turntable, as follows: 1. By collector rings and brushes at the center of the turn- novembeb. 1902. AMERICAN ENGINEER AND RAILROAD JOURNAL. SS6 table 2. By trolley wires placed on the walls of the pit. 3. Byan overhead device with collector rings and brushes. The first method is by far the best, provided the design of thetable permits its use. The wires from the power house areled underground and up through the center-casting to station-ary collector rings. Attached to the turntable are brusheswhich collect the current from the stationary rings and main-tain a perfect circuit, independent of the position of the turn-table. This arrangement is the most simple and the leastliable to give trouble. Many turntables, however, are builtwith center pivots cast solid, in which event the device de-scribed above cannot be employed. For a turntable of thisdescription, the second method, illustrated in Fig. 3, is sug-gested. Two trolley wires, in chords of 6 or 8 ft., are. FiG. 4. placed around the wall of the pit, supported by trolley hangersof the toggle type, ordinarily used in electric mine trolley poles are flexibly attached to the donkey, so asto allow a horizontal movement on account of the variation inthe trolley wires and a vertical movement to accommodate thetilting of the table. This scheme is simple and inexpensiveand in practice has operated in a very satisfactory manner. In some places, on account of the possibility of the pit beingflooded, neither of the arrangements described above is practi-cable and it becomes necessary to collect the current fromabove the turntable. A very ingenious arrangement for thispurpose has been used on a turntable at Long Island City,where the pit occasionally fills with sea water. A structure iserected at the center of the turntable and supports, directlyabove the pivotal point, a device embodying collector rings andbrushes, tveierring to Fig. 5. the ca
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
