Compressed air production; or, The theory and practice of air compression . ft\^-. when there is no work to perform. At the beginning of the stroke,steam at the boiler pressure is admitted behind the piston, and as the airpiston at that time is also at the initial point in the stroke, it has only COMPRESSED AIR PRODUCTION. 27 free air against it. The two pistons move simultaneously as the resist-ance in the air cylinder rapidly increases as the air is compressed. To geteconomical results it is, of course, necessary to cut off in the steamcylinder so that at the end of the stroke, when the stea
Compressed air production; or, The theory and practice of air compression . ft\^-. when there is no work to perform. At the beginning of the stroke,steam at the boiler pressure is admitted behind the piston, and as the airpiston at that time is also at the initial point in the stroke, it has only COMPRESSED AIR PRODUCTION. 27 free air against it. The two pistons move simultaneously as the resist-ance in the air cylinder rapidly increases as the air is compressed. To geteconomical results it is, of course, necessary to cut off in the steamcylinder so that at the end of the stroke, when the steam pressure is low,as indicated by the dotted line (Fig. n), the air pressure is high, assimilarly indicated in the other cylinder. The early direct-acting com-pressor used steam at full pressure throughout the stroke. The Westing-house pump applied to locomotives, is built on this principle, and thosewho have observed it work have perhaps noticed that its speed of strokeis not uniform, but that it moves rapidly at the beginning, gradually re-ducing its speed, and then seems to
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Keywords: ., bookcentury1800, bookdecade1890, bookid, booksubjectcompressedair
