. Electric railway journal . ures, heaters, jumper connections, circuit-break-ers, etc. The most elaborate installation of this kind is March 15, 1913. | ELECTRIC RAILWAY JOURNAL 485 the armature outfit for testing poor soldering, commutatorshort-circuits, or short-circuits in the armature itself. Theequipment comprises a rheostatic controller, a set of carresistances which give any desired amount of currentfrom 8 amp to 300 amp in order to include the currentsused by the motors in service, an ammeter to measure thecurrent going through the armature coils and a millivolt-meter to note the drop
. Electric railway journal . ures, heaters, jumper connections, circuit-break-ers, etc. The most elaborate installation of this kind is March 15, 1913. | ELECTRIC RAILWAY JOURNAL 485 the armature outfit for testing poor soldering, commutatorshort-circuits, or short-circuits in the armature itself. Theequipment comprises a rheostatic controller, a set of carresistances which give any desired amount of currentfrom 8 amp to 300 amp in order to include the currentsused by the motors in service, an ammeter to measure thecurrent going through the armature coils and a millivolt-meter to note the drop between commutator bars. By pass- motor equipments are set at 275 amp. Armatures of com-pressor motors can have an additional given running test byinstalling them in a compressor located near the field-testingoutfit. As this compressor is furnished with a split frame,the armatures are taken in and out very readily. In the field-testing apparatus shown on page 482 theprinciple of the transformer is used. The field under test. B. R. T. Electrical Shops—Commutator Slotter for LargeArmatures B. R. T. Electrical Shops—Cylindrical Tank for Blowing OutArmatures ing an operating current through the armature it is possi-ble to discover such defects as would otherwise developafter the armature had been placed in service on the car,namely, melting of poorly soldered connections and theburning off of abraded wires. By permitting the armatureto receive exactly the same current as if it was installedbetween the fields of its motor, the practical benefits of anactual test on the car are obtained without the inconven-ience of removing and replacing an armature which mightprove defective. The connections of the armature-testing outfit are indi-cated in the accompanying wiring diagram and other de-tails are shown in two accompanying halftones, particularlythe adjustment of the brush holders for any size commuta-
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