. The science of railways . Nine and One-half Inch Air Pump. 60.—Top Head, complete. 81. 61.—Steam Cylinder, complete. 62.—Center-piece, complete. 63.—Air Cylinder, complete. 85. 64.—Lower Head. 86. 65.—Steam Piston and Rod. 87. 66.—Air Piston, complete. 68.—Piston Rod Nut. 69.—Reversing Valve Plate. 71.—Reversing Valve Rod. 75.—Main Valve Bushing. 76.—Main Piston Valve, complete. 77.—Main Valve Piston, Large Head. 10.\ 79.—Main Valve Piston, Small Head. vol 18 -Main Valve Stem. -Main Slide Valve. -Right Main Valve Cylinder Head. -Left Main Valve
. The science of railways . Nine and One-half Inch Air Pump. 60.—Top Head, complete. 81. 61.—Steam Cylinder, complete. 62.—Center-piece, complete. 63.—Air Cylinder, complete. 85. 64.—Lower Head. 86. 65.—Steam Piston and Rod. 87. 66.—Air Piston, complete. 68.—Piston Rod Nut. 69.—Reversing Valve Plate. 71.—Reversing Valve Rod. 75.—Main Valve Bushing. 76.—Main Piston Valve, complete. 77.—Main Valve Piston, Large Head. 10.\ 79.—Main Valve Piston, Small Head. vol 18 -Main Valve Stem. -Main Slide Valve. -Right Main Valve Cylinder Head. -Left Main Valve Cylinder Head. -Air Valves. -Air Valve Seats. -Air Valve Cages. -Valve Chamber Caps. -Stufflns^ Boxes. -Stuffing Box Nuts. -Stuffing Box Glands. -Air Cylinder Oil-cup. -Drain Cocks. -Air Strainer. 314 APPENDIX Nine and One-half Inch Air Pump. 60.—Top Head, —Steam Cylinder, ~Center-piece, —Air Cylinder, —Lower —Steam Piston and —Reversing Valve —Reversing Valve Rod72.—Reversing —Reversing Valve Chamber Bush-ing. -Reversing Valve Chamber Valve Bushing.—Main Slide Valve Cages.—Valve Chamber Box Box Glands.—Drain Cocks.—Air Strainer. APPENDIX B. 315 Each upward and each downward stroke of thesteam piston causes a corresponding movementof the air piston in the lower cylinder. In thisair cj^linder are two sets of valves that lift when-ever the pressure below them is greater than thatabove; thus both the top and the bottom sides ofthe air piston have valves to admit air from theatmosphere when the piston is receding, and thisvalve closes as soon as the piston reverses; thedir that is drawn in on the
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1900
