. Science of railways . djust tension of brush spring No. 43, sUghtly back off screwNo. 1055 and manipulate screw No. 420 as necessary. Thentighten screw No. 1055. Once adjusted properly the brush springsrequire no further attention. Field Coils. The correct position and electrical connections ofthe field coils can be noted from Fig. 1. Bolts No. 474 and460 which hold fields in place should be drawn up tight other-wise dynamo will not generate properly. Field covers mustalways be replaced as these afford protection against dampnessand dirt. Internal Wiring. As shown in Fig. 1 the inside leads(
. Science of railways . djust tension of brush spring No. 43, sUghtly back off screwNo. 1055 and manipulate screw No. 420 as necessary. Thentighten screw No. 1055. Once adjusted properly the brush springsrequire no further attention. Field Coils. The correct position and electrical connections ofthe field coils can be noted from Fig. 1. Bolts No. 474 and460 which hold fields in place should be drawn up tight other-wise dynamo will not generate properly. Field covers mustalways be replaced as these afford protection against dampnessand dirt. Internal Wiring. As shown in Fig. 1 the inside leads(both series and shunt wires), from the top field connect respec-tively to the outside leads of the bottom field. The outside leadof top shunt coil connects to top brush holder and the inside leadof bottom shunt coil connects to bottom brush holder. The insidelead of bottom field connects to top binding post, and the bottombinding post is connected to the bottom brush holder by means of ajumper. 32 LOCOMOTIVE 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
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