. Science of railways . Fig. 2. The Mudd Track Sander. (Plan View.). Fig. 3 The Mudd Track Sander. (Side View.) LOCOMOTIVE APPLIANCES. 691 engineers valves should be one-quarter inch copperpipe, and placed under the jacket. There should be placed in the top of the sand box,as shown in Fig. 1, a one-quarter inch mesh nettingto insure screened sand at all times. The back-up sander should be placed directly overthe forward delivery apparatus, and as near thebottom of the box as it is possible to get it. The air pressure should be taken from the reservoirpipe attached to the engineers valve. 692 L
. Science of railways . Fig. 2. The Mudd Track Sander. (Plan View.). Fig. 3 The Mudd Track Sander. (Side View.) LOCOMOTIVE APPLIANCES. 691 engineers valves should be one-quarter inch copperpipe, and placed under the jacket. There should be placed in the top of the sand box,as shown in Fig. 1, a one-quarter inch mesh nettingto insure screened sand at all times. The back-up sander should be placed directly overthe forward delivery apparatus, and as near thebottom of the box as it is possible to get it. The air pressure should be taken from the reservoirpipe attached to the engineers valve. 692 LOCOMOTIVE APPLIANCES. MECHANICALLY OPERATED FIRE DOORS It is generally conceded now that a mechanically operatedfire-box door accomplishes everything claimed for it, and itsadoption by the various railroads has been from-a standpoint ofbetter firing, greater efficiency, and more economy than can beobtained with the hand operated old style door. The actual generation and utilization of the steam is en-tirely in the hands of the engine crew, and the greatest factori
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