. Science of railways . Fig. 4 round, the armature must be removed and the com-mutator trued up in a lathe. A sharp V-tool mustbe used and light high speed cuts taken in truingup. On removing from the lathe, burrs will befound projecting over the mica grooves. To pre-vent short-circuiting, the commutator burrs mustall be removed with a small, three-cornered file,after which the commutator must be cleaned andpolished with a strip of fine sand-paper (not emerypaper). See Fig. 4. 20 LOCOMOTIVE APPLIANCES. The lamp.—The lamp is simple, durable and re-liable. After a few trials it will be found an
. Science of railways . Fig. 4 round, the armature must be removed and the com-mutator trued up in a lathe. A sharp V-tool mustbe used and light high speed cuts taken in truingup. On removing from the lathe, burrs will befound projecting over the mica grooves. To pre-vent short-circuiting, the commutator burrs mustall be removed with a small, three-cornered file,after which the commutator must be cleaned andpolished with a strip of fine sand-paper (not emerypaper). See Fig. 4. 20 LOCOMOTIVE APPLIANCES. The lamp.—The lamp is simple, durable and re-liable. After a few trials it will be found an easymatter, even in the dark,—should circumstancesrequire,—to trim the lamp. In putting in the car-bon, it will be found much better to remove the car-. Fig. 5 bon clamp, 87 and 88, from the slide, 100. To cleanthe reflector remove the top guide, 100; first remov-ing by imscrewing the winged thumb nut, 79, at thetop of the upper arm of lamp frame. The guide,carbon and the holder mav then be taken from the LOCOMOTIVE APPLIANCES. 21 lamp. After disconnecting from their bindingposts the lead wires—always observing whetherthe end of one is doubled over so there will be nochance to connect them up wrong—the reflector onits slide may be pulled from the case. The tension spring, 93, on the lamp is for onepurpose only. Its function is to counterbalancethe weight of the levers and also of the iron core,64, in the solenoid; so that the clutch may releasethe carbon. The tension on the spring, 93, shouldbe adjusted when there is no current passingthrough the lamp. The tension of this springshould be sufficient only to bring magnet yoke, 90,up against the stop lug on the lamp column, 51%. If the tension spring is too loose the light willflash
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