. Science of railways . Fig. 1 LOCOMOTIVE APPLIANCES. 33 ARC LAMP It is very important that the arc lamp be kept in good workingcondition and careful inspection at frequent intervals should be 252. Fig. 2—Arc Lampmade to see that the lamp mechanism works freely, that currentcarrying surfaces are clean, that no grounds exist, that arc is inproper focus and that all screws and connections are tight. 34 LOCOMOTIVE APPLIANCES. To adjust clutch mechanism insert a carbon in lamp so that itrests squarely on copper electrode. Also see that carbon and copperelectrodes are in line. With no current flowi
. Science of railways . Fig. 1 LOCOMOTIVE APPLIANCES. 33 ARC LAMP It is very important that the arc lamp be kept in good workingcondition and careful inspection at frequent intervals should be 252. Fig. 2—Arc Lampmade to see that the lamp mechanism works freely, that currentcarrying surfaces are clean, that no grounds exist, that arc is inproper focus and that all screws and connections are tight. 34 LOCOMOTIVE APPLIANCES. To adjust clutch mechanism insert a carbon in lamp so that itrests squarely on copper electrode. Also see that carbon and copperelectrodes are in line. With no current flowing through the lamp, unscrew jam nutNo. 771 and back off screw No. 735 until there is no pressure exertedby the spring No. 742. Loosen thumb nut No. 722 and adjusttension of spring No. 732 such that the clutch ring No. 785 is at aehght angle but not sufficient to prevent the free movement ofthe carbon when raised and lowered by hand. That is, the clutchshould not grip the carbon. Thumb nut No. 722 should now betightened. The current should now be turned on and the lamp carbon willhave a tendency to jump. Screw No. 735 should next be tightenedup to increase the pressure of spring No. 742,
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