. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . and raise themain reservoir pressure on each car andthe main reservoir line throughout thetrain until such time as the governor setfor the highest cutting out pressure(which will be the governor that operatesto cut in the compressors) acts to openthe circuit of the switch compressorswitch magnets. This causes the com-pressor switches to cut out and likewisestop the operation of all compressorssimultaneously. Brake Valve Manipulation. The previous articles on locomotivebrake inspection have le
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . and raise themain reservoir pressure on each car andthe main reservoir line throughout thetrain until such time as the governor setfor the highest cutting out pressure(which will be the governor that operatesto cut in the compressors) acts to openthe circuit of the switch compressorswitch magnets. This causes the com-pressor switches to cut out and likewisestop the operation of all compressorssimultaneously. Brake Valve Manipulation. The previous articles on locomotivebrake inspection have led up to the sub-ject of brake valve manipulation, or trainhandling, and this in itself is, from onepoint of view, too broad a proposition tobe handled in printed form; but fromanother viewpoint it is possible to con-dense a great deal of the printed matterthat relates to train handling, and printedinstructions should be confined to, or con-cerned with, how the brake operates,rather than how the brake should beoperated. The modern air-brake in-structor makes no special effort to tell covHHoa ca«.. i NCMROWIIOC ST&TCM * O* t i MAK C»CUIT WIRING DIAGRAM OF GOVERNOR SYNCHRONIZING SYSTEM. from the trolley to the compressor motor, cuit from the trolley to the compressor an engineer how the brake should be When the main reservoir pressure falls motor, below the cutting in point of the regula- With a trolley or third rail system, tion of the master governor, the magnet the magnets are connected in parallel be- of the compressor switch is energized and tween the synchronizing wire and the armature 504 is drawn toward magnet ground, and the wiring is so arranged handled, only in a general way, and con-tines himself to a demonstration of howthe brake operates under the various con-ditions, and leaves the results to thejudgment of the engineer. 58 RAILWAY AND LOCOMOTIVE ENGINEERING. February, 1916. With this in mind, an effort will bemade to sum up the matters that aregenerally co
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