Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . FIGURE 18. off, Fig. 16. The crank has now traversed 1200 andthe highest point of the eccentric is at 60 ° on thereturn circle, a point equivalent to 240 ° of the circledescribed by the crank. The fourth function is when compression begins atthe head end of the cylinder, Fig. 17. The crank is 138 ENGINEERING now at 1500, the piston being near the end of the strokeand the eccentric has reached 900 of the return circleor three-quarters of the crank circle, while the crankhas still to travel 300 in o
Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . FIGURE 18. off, Fig. 16. The crank has now traversed 1200 andthe highest point of the eccentric is at 60 ° on thereturn circle, a point equivalent to 240 ° of the circledescribed by the crank. The fourth function is when compression begins atthe head end of the cylinder, Fig. 17. The crank is 138 ENGINEERING now at 1500, the piston being near the end of the strokeand the eccentric has reached 900 of the return circleor three-quarters of the crank circle, while the crankhas still to travel 300 in order to complete the first one-half of its circle. At this point we can study the effectof inside lap, because if the valve has no inside lap,release on the crank end will begin almost at the samemoment that compression takes place at the head end,. /to 90* FIGURE 19. but by adding inside lap, compression can be causedto take place earlier and release later. The next event is admission at the head end of thecylinder, Fig. 18. The crank has now arrived at 1800,having completed one-half of a revolution; the pistonis at the end of the stroke, and the eccentric is at1200 on the return path. Fig. 19 serves to better illus-trate the relative positions of the crank pin and VALVES AND VALVE SETTING 189 eccentric during the stroke. The inner circle repre-sents the path described by the high point of theeccentric, and the large circle that of the crank radius C 2 of the small circle represents the throwof the eccentric, and the distance C L is the lap of thevalve plus the lead. The point of intersection of thevertical line, L 1, with the eccentric circle locates theposition of the highest point of the eccentric, andthe line C B, drawn from the center of the crank shaftthrough this point, indicates the angular advance,which in this
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