Locomotive appliances . Fig. 26. Pio. 87. Sectional Duplex Air Gauge. phore gauge, is shown in Figs. 26 and ?7. Thepoints of difference in this gauge are the use o( singleBourdon springs with auxiliary springs (as described 106 LOCOMOTIVE APPLIANCES. more fully under Steam Gauges) and the black dialwith white figures so arranged that their positions forthe three pressures, fifty, seventy and ninety poundsper square inch (the most important pressures to theengineer for operating the air brake) enable him toinstantly and accurately observe the variations ofpressures in his air bra
Locomotive appliances . Fig. 26. Pio. 87. Sectional Duplex Air Gauge. phore gauge, is shown in Figs. 26 and ?7. Thepoints of difference in this gauge are the use o( singleBourdon springs with auxiliary springs (as described 106 LOCOMOTIVE APPLIANCES. more fully under Steam Gauges) and the black dialwith white figures so arranged that their positions forthe three pressures, fifty, seventy and ninety poundsper square inch (the most important pressures to theengineer for operating the air brake) enable him toinstantly and accurately observe the variations ofpressures in his air brake system; for the two extremepressures of fifty and ninety always stand at rightangles with the seventy pounds pressure point whichis at the top of the dial. On this dial a much widerspace is allowed for each five pounds pressure, so asto insure closer and more accurate reductions in trainbraking. The glass over the dial is an oval crystallike a watch, and while the case does not extend infront of the glass as usual to
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectlocomot, bookyear1901
