Railway and Locomotive Engineering . ition No. 13, allports are open as indicated in No. 12. piston are wide open and both ports serv-ing with the outer piston are closed; theport F being at the point of closure of theexhaust from the left hand side of theouter piston. In position No. 15, the crank has passedto a point about 5° beyond the left handcenter. Both ports serving the inner pis-ton are wide open and both serving theouter piston are closed with the port Djust opening the exhaust from the righthand side of the outer piston. open when the crank is about 10° beyondthe center and the cut-
Railway and Locomotive Engineering . ition No. 13, allports are open as indicated in No. 12. piston are wide open and both ports serv-ing with the outer piston are closed; theport F being at the point of closure of theexhaust from the left hand side of theouter piston. In position No. 15, the crank has passedto a point about 5° beyond the left handcenter. Both ports serving the inner pis-ton are wide open and both serving theouter piston are closed with the port Djust opening the exhaust from the righthand side of the outer piston. open when the crank is about 10° beyondthe center and the cut-off occurs at about10° before the crank reaches the oppositecenter. The exhaust opening occurs about5° after the crank has passed its centerand closes about 5° before it has reachedthe center. Therefore, the admis-sion is open through 160° of the revolu-tion of the crank, and the exhaust is openthrough 170°, leaving about 15° of travelat each end where both ports are , when one set of ports for one piston. ILLUSTRATION OF OPENING AND CLOSING OF PORTS ON ELVIN MECHANICAL STOKER In position No. 13 the crank is approach-ing the left hand center and is distantabout 10° from it. The ports serving theinner piston are wide open to the admis-sion to the bottom and the exhaust fromthe top. The port F has nearly closed theexhaust from the left hand side of theouter piston and the port D is on the pointof cut-off from the right hand side. In position No. 14, the crank lacks 5°of reaching the left hand center. The portsserving the top and bottom of the inner In position No. 16, the crank has passedto about 10° beyond the left hand ports serving the inner piston areopen as before in No. 15. The port Dhas opened the exhaust from the righthand side of the outer piston to a slightextent and the point of admission has beenreached for the port F serving the lefthand end of the outer piston. From this to position No. 1, all portsare open. Thus it appears
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